Microevolution occurs when what kind of frequencies change?

Answers

Answer 1
Microevolution is the change in allele frequencies that occurs over time within a population. This change is due to four different processes: mutation, selection (natural and artificial), gene flow and genetic drift.

Related Questions

How would this impact the organism?

Answers

Answer:

how would what impact the organism?

A euglena is a unicellular organism. Choose an everyday object, such as a car, to use as a model of this euglena. Explain how the parts of the object model how the euglena's cell parts help it stay alive.

Answers

Answer:

a car:

Flagellum  is a long thread-like structure that works as a navigator or a steering wheel in a car. The thin filament helps an euglena to move forward in any direction it desires.

Cell membrane is like the doors on a car. They regulate what goes in/out. The cell wall in a plant cell is like the frame on a car. The frame supports the car as the cell wall supports the plant.

The Nucleus is like the front seat of your car because the driver is in control of what the car does, goes, and what happens inside of the car.

Vacuoles is like the Trunk of your car because you store food, water and other wastes into your trunk, like were all the things go in the vacuoles.

The compression stroke in a car engine is like chloroplasts because it gas to fuel a car the same way chloroplasts convert solar energy in to chemical energy for a cell.

Mitochondrion is like the battery on a car. It gives the motor energy so it can run like the mitochondrion produces energy for the cell.

Eyespot is like a radio, because in some cars, radios pull power directly from the battery from the car battery, and this is why you will get the car radios on while the engine is off

Explanation:

The internal structures found in a typical photosynthetic Euglena are as follows:

Pellicle: A thin, flexible membrane that supports the plasma membrane and helps them to change shape

Plasma Membrane: The selectively permeable membrane that protects the inner content of the cell from the outside environment

Cytoplasm: A jelly-like substance distributed throughout the cell that contains all the cell organelles

Chloroplast: Contains the green pigment chlorophyll that helps them to produce food using sunlight by photosynthesis

Nucleus: A membrane-bound organelle that contains the genetic material, DNA. It also contains a distinct nucleolus that contains RNA and helps the cell to synthesize proteins

Mitochondria: The energy-producing organelle that forms ATP. All cellular activities such as movement and reproduction are performed using the mitochondrial energy source

Ribosomes: Consists of RNA and proteins, and are responsible for producing all cellular proteins

Golgi Apparatus: Manufactures, stores, and transports large molecules such as carbohydrates and proteins within the cell

Endoplasmic Reticulum: The extensive network of membranes that helps to package and transport proteins to different organelles. It is of two types: rough endoplasmic reticulum (RER) – containing ribosomes attached to it; and smooth endoplasmic reticulum (SER) – devoid of ribosomes

Lysosomes: Small membrane-bound organelles filled with hydrolytic enzymes that break down large molecules such as carbohydrates, fats, and proteins

Contractile Vacuole: It maintains the water and salt balance within the cell

Reservoir: The inward pocket present near the base of the flagella where contractile vacuole dispels excess water

Flagellum: A long whip-like structure attached externally to the cell body that helps in cell movement. An amoeba contains two flagella, a short one that does not protrude out of the cell, and a long one that helps in swimming

Eyespot: A region that is highly colored and contains red-colored carotenoid pigments that help in the detection of light. It is sometimes called a stigma

Photoreceptor: Also known as the paraflagellar body, it is the light-sensitive region located near the flagellum that helps to detect light. It also helps in their movement towards and away from light stimuli, a process known as phototaxis  

Paramylon: They are stored starch-like carbohydrate granules composed of glucose produced during photosynthesis. Paramylon enables the organism to survive in low-light conditions when photosynthesis is not possible by acting as the food reserve for the cell. When the paramylon is enclosed in a sheath of polysaccharide, it is called the paramylon sheath of pyrenoid.

The flagellum of euglena, can be compared to the wheels of a car, as they are responsible for the movement of both.

What is Euglena?

Euglena is a genus of single-celled flagellated algae that can occur either as free cells or in colony form.

What is flagellum?

Euglenophytes have the presence of flagella as their main characteristic. They have two flagella, one longer than the other. The smaller flagellum does not emerge from the cell. The larger one is mainly used for locomotion.

With this information we can conclude that euglena has flagella for locomotion just as cars have wheels for locomotion.

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Which object has the most gravitational pull?

Answers

Answer:

Jupiter, the fifth planet from the Sun, has the strongest gravitational pull because it's the biggest and most massive.

Explanation:

Answer:

Jupiter

Explanation:

HELP HELP HELP
Which of these areas control voluntary actions over internal and external intercostals muscles?
C. pons

A. Cerebral cortex

B.carotid bodies

D. medulla

Answers

the answer is going to be b

How do we know that the ocean is continually absorbing carbon from the atmosphere, helping with climate stability?
O Increased carbon in the oceans have made them more acidic.
O Ocean pH has increased significantly in the last decade.
O There are bubbles like carbonation on the ocean surface.
O Fish we catch and eat from the ocean are made of carbon.

Answers

The concentration of carbon is increased in the oceans have made them more acidic.

Increased carbon concentration in the oceans which have made the ocean water more acidic is the indication that more carbon is absorbed by the ocean. When carbon absorbed by the ocean, the carbon reacts with water which produced carbonic acid.

This carbonic acid decrease the pH of the ocean water that adversely affect the marine organisms especially coral reefs. When the pH of the ocean water increases, bleaching of coral reef occurs because the algae living on them die so we can conclude that the concentration of carbon is increased in the oceans have made them more acidic.

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Answer:

A

Explanation:

Increased carbon in the oceans has made them more acidic.

which term describes the site of a muscle attaching to the bone that moves the most?

Answers

Answer:

Insertion

Explanation:

explain how the structure and the function of squamous epithelium in the lung are important for gas exchange​(4 marks)​

Answers

Squamous cells area one single layer and flattened, this allows for diffusion of oxygen and carbon dioxide to happen easily in the lungs.

Eukaryotes are __________________ and include __________________________.

Answers

Answer: Eukaryotes are the cells of animals, plants, and fungi and include membrane-bound organelles such as a nucleus and mitochondria.

Explanation: Hoped this helped! :D

which system is responsible for preventing pathogens from disturbing homeostasis?

Answers

Answer:

The immune system protects the host from pathogenic organisms (bacteria, viruses, fungi, parasites). To deal with this array of threats, the immune system has evolved to include a myriad of specialised cell types, communicating molecules and functional responses.

Explanation:

which of the following hormones produced in the anterior pituitary stimulates the production of progesterone and estrogen by ovaries and is needed for ovulation?

Answers

Luteinising hormone stimulates the corpus luteum to produce progesterone, which is required to support the early stages of pregnancy, if fertilisation occurs.

Luteinizing hormone stimulates the corpus luteum to produce progesterone, which is required to support the early stages of pregnancy, if fertilization occurs.

what are the role of Luteinizing hormone ?

These hormone are released from ductless Endocrine cells which release their secretion i.e., hormones directly into blood.

The  FSH (follicle stimulating hormone) is secreted by pituitary gland  which helps in controlling menstrual cycle and stimulation of ovaries for egg production.

The hormone LH (Luteinizing hormone) is secreted from pituitary gland,  helps in physical development and maintaining pregnancy.

Thus, both FSH and LH are produces by pituitary gland and their functions are to control menstrual cycle and maintaining pregnancy respectively.

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the part of the brain that coordinates the movement of skeletal muscles

Answers

I believe it’s the cerebellum.

which statements accurately reflect the permeability of the cell membrane? choose all that apply

Answers

Answer:

The hydrophilic part of the cell membrane is A, the phosphate head.

Charged molecules, such as K+ or Ca++ are unable to pass through the lipid bilayer because of their charge and must use a membrane protein to cross the cell membrane.

C, the lipid tails, are hydrophobic and repel water.

Explanation:

Describe solar energy:

Answers

Answer: the light and heat that come from the sun

Explanation:

That’s it lol

function of nucleus, mitochondria ,endoplasmic reticulum, vacuoles ​

Answers

Answer:

nucleus...controls all the activities of the cell and carrries the genes

mitochondria..site for respiration that yields energy for the cell

endoplasmic reticulum... protein synthesis and lipids metabolism

vacuoles.... handle waste products and are responsible for regulation of osmotic pressure of a cell also

Explanation:

is this helpful?

The nucleus controls and regulates the activities of the cell (e.g., growth and metabolism) and carries the genes, structures that contain the hereditary information.

Mitochondria are membrane-bound cell organelles (mitochondrion, singular) that generate most of the chemical energy needed to power the cell's biochemical reactions.

A vacuole is a membrane-bound cell organelle. In animal cells, vacuoles are generally small and help sequester waste products.

The endoplasmic reticulum can either be smooth or rough, and in general its function is to produce proteins for the rest of the cell to function.

Hope this helps!!

(It’s a big paragraph to know it but you will understand)

the oceans lower atmosphere and contitents are the part of

Answers

Answer:

The oceans, lower atmosphere and contitents are the part of the Biosphere.

3. An animal population decreases from 800 individuals to 600 individuals. Which of the following could explain this
change in population size?
A. The population size of the animal's predator increased.
B. The emigration rate of the animals from the population decreased.
C. The population size of the animal's prey increased.
D. The number of species competing with the animal for food decreased.
RESOURCE:
ASAP

Answers

The statement that could explain the reason for the decrease in population of an animal from 800 individuals to 600 individuals is: The population size of the animal's predator increased.

POPULATION:

Population refers to a collection or assemblage of individuals of a species of organism. A population decrease means loss of individuals of a species.

Population decrease can be attributed to the following reasons:

Increase in the number of predators of that species. Emigration i.e. moving outIncrease in competition within the population

This means that a population decrease in the animal in this question could be caused by an increase in the population of predators.

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Answer the following for 20 points

Answers

For question 11 put quartzite n for question 12 put slate

WILL GIVE BRAINLIEST!!

Most of the world's iron ore, including that found in northern Minnesota, formed during the middle Precambrian period, ranging in age from 1.8 to 2.5 billion years old. They are composed of alternating layers of iron-rich material, most often magnetite or hematite, and silica. These iron oxide minerals formed on the ocean floor, creating the banded iron deposits you see here. What was the source of the oxygen that helped to produce these deposits?

A) The oxygen that was released into the atmosphere as a by-product of photosynthesis caused iron deposits to oxidize creating the iron oxide minerals.

B) Photosynthetic organisms making oxygen as a by-product of photosynthesis and the oxygen reacted with the iron dissolved in seawater to form iron oxide minerals.

C) The decomposition of carbon-based life forms in the oceans released oxygen and carbon dioxide. These gases reacted with the iron deposits forming the minerals mentioned.

D) In Earth's early biosphere, there were not organisms that underwent aerobic cellular respiration and an excess of oxygen built up in the atmosphere. This oxygen reacted with iron deposits to form iron oxide minerals.

Answers

Answer:

b

Explanation:

Answer:

) Photosynthetic organisms making oxygen as a by-product of photosynthesis and the oxygen reacted with the iron dissolved in seawater to form iron oxide minerals.

Explanation:

what is happening in the convection layer of the Sun

Answers

Answer:

In the convective zone, the temperatures are cool enough—under 1,800,000 degrees Fahrenheit (1,000,000 degrees Kelvin)—that the atoms in the plasma there can absorb the photons coming outward from the Sun's radiative zone. The plasma gets very hot, and begins to rise upward out of the Sun.

What is the difference between permanent gases and variable gases in the atmosphere?

Answers

Answer:

the difference is that permanent gases have larger residence times and Variable gases have shorter residence times

the difference between permanent gases and variable gases in the atmosphere is permanent gases are gases that have a very low dew point.

What are the characteristics of the atmosphere?

The Earth's atmosphere is basically composed of a mixture of gases, being 78% Nitrogen, 21% Oxygen and 1% Argon. In addition, traces of carbon dioxide, water vapor and other gases are found, but in very small amounts.

In this way,  permanent gases are gases that have a very low dew point.

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the anterior pituitary hormone that controls the release of glucocorticoids from the adrenal cortex is __________.

Answers

Answer:

Adrenocorticotropic Hormone (ACTH)

Explanation:

Explanation:

Adrenocorticotropic hormone (ACTH)

The species that plays the biggest role in the habitat is?

Answers

Answer:

A keystone species is a species that plays an essential role in the structure, functioning or productivity of a habitat or ecosystem at a defined level (habitat, soil, seed dispersal, etc)

Answer:

the one that does the most damage, both to its habitat and the population of species around them.

Explanation:

what are the functions of the cells in the chloroplast

Answers

Answer:

Chloroplasts are plant cell organelles that convert light energy into relatively stable chemical energy via the photosynthetic process. By doing so, they sustain life on Earth. ... Chloroplasts are plant cell organelles that convert light energy into relatively stable chemical energy via the photosynthetic process.

Explanation:

Chloroplasts are plant cell organelles that convert light energy into relatively stable chemical energy via the photosynthetic process. By doing so, they sustain life on Earth. ... Chloroplasts are plant cell organelles that convert light energy into relatively stable chemical energy via the photosynthetic process.

What happens to the cell's
genetic information during the cell cycle?

Answers

Answer:

Mitosis results in two nuclei that are identical to the original nucleus. So, the two new cells formed after cell division have the same genetic material. During mitosis, chromosomes condense from chromatin. ... At the end of mitosis, the cell has two identical sets of chromosomes in two separate nuclei.

Explanation:

PLEASE HELP ME I NEED HELP​

Answers

Answer:

D

Explanation:

Hope this helps

Answer:

I'm pretty sure its D - hibernation

Explanation:

Torpor means a state of physical or mental inactivity, or lethargy.

Hibernation means an extended period of inactivity.

They are both used for survival in cold weather.

A cross between a red cow and a white bull produces an offspring with a roan color (a spotted red-and-white color). This exhibits what type of genetic inheritance?

Answers

Answer:

co-dominance

Explanation:

in co-dominance both parents are dominant

26.
Which of the following food chains
shows one way that energy moves
through an ocean ecosystem?
A fish plankton + whale → squid
B squid whale fish plankton
C plankton squid fish whale
D whale fish plankton → squid

Answers

Answer:

C

Explanation:

ans is C Wait a minute, I'll be right back.

how to mark someone brainlist

Answers

Answer:

when two people has answered your question you will see a crown on your answer and then you select the answer that is right

Explanation:

which words help determine the meaning of the word vividly in paragraph 1

Answers

context clues,

the meaning is a strong image

Which of the following best predicts the effect of not having ATP available to supply energy to this
process?
A. H+ ions will stop moving through the protein.
B. H+ ions will move in the other direction through the protein.
C. H+ ions will continue to move through the protein in the original direction but at a slower rate.
D. H+ ions will begin to move through the phospholipid portion of the membrane in the original direction.

Answers

H+ ions will stop moving through the protein is the effect of not having ATP

available to supply energy to this process.

ATP is the form of energy used by cells and it ensures that cells perform their

daily activities optimally. ATP is needed in a lot of metabolic reactions and

transportation of materials within cells.

When there is a lack of ATP, it means there is no energy required to

transport or move substances within a cell. This means that the H+ ions will

stop moving through the protein and is the most appropriate choice.

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