Answer: Middle stages
Explanation:
Answer:
Earliest stages
Expation:
1. What is the most important mutation that led to human life?
Answer:The ultimate source of all genetic variation is mutation. Mutation is important as the first step of evolution because it creates a new DNA sequence for a particular gene, creating a new allele. Recombination also can create a new DNA sequence (a new allele) for a specific gene through intragenic recombination.
Explanation:
A farmer has been trying to increase his crop yield for the last 10 years by
adding about 25% more fertilizer to his crops than he needs. What will most
likely result from this action?
Select one:
a. Increased crop yields.
b. Air pollution from the excess fertilizers
c. Soil degradation form the excess fertilizers
d. The additional fertilizer will have little to no impact.
Answer:
The correct answer is - b. Air pollution from the excess fertilizers
Explanation:
In long term using excess amount of fertilizer than requirement will lead to several condition such a soil acidity, soil degradation, soil leacing, eutrophication of waterways and many but more improtant is green house gases and air pollution.
Using the excess amount of fertilizer does not help in increasing crop yield but gives negative impact. Using fertilizer more than requirement wil lead to release of toxic and harmful gases in atomosphere and fuming.
5. The double helix model of DNA explained Chargaff's rules
because
A. adenine could hydrogen-bond with thymine and
guanine could hydrogen-bond with cytosine to hold the
helix together.
B. a helix repeats itself many times over, so the four bases
in DNA can repeat themselves many times.
C. adenine and thymine are found in one strand of the
double helix and guanine and cytosine are found in the
other strand.
OD. adenine could change places with thymine while
munninn anuld chanannhan with
Answer:A adenine could hydrogen-bond with thymine and guanine could hydrogen bond with cytosine to hold the helix together
Explanation:
The double helix model of DNA explained Chargaff's rules because adenine could hydrogen-bond with thymine and guanine could hydrogen-bond with cytosine to hold the helix together. The correct option is A.
What is Chargaff's rule?According to Chargaff's criteria, guanine and cytosine should be equal in amount in the DNA of every species and organism, and adenine and thymine should be equal in amount.
Additionally, the purine and pyrimidine bases should be in a 1:1 stoichiometric ratio.
The ratio of the several nitrogenous bases present inside the DNA molecule is described. It assists in figuring out the makeup and structure of DNA in various species.
Because adenine could hydrogen bond with thymine and guanine could hydrogen bond with cytosine to maintain the helix together, the double helix model of DNA provided an explanation for Chargaff's rules.
Thus, the correct option is A.
For more details regarding Chargaff's rule, visit:
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someone please help me, I’ve done this like 10 times.
Roundworms
Type of skeleton (ENdoskeleton, EXoskeleton, or None)
Type of appendages (Jointed, Not Jointed, or Absent)
Segmentation (Present or Absent)
Type of symmetry (Radial, Bilateral, or None)
Answer:
Think about it. Worms move with MUSCLES. So the first answer is None.
The appendage of a roundworm is not present.
How do you think worms turn and move? They are segmented. The symmetry of a worm is Bilateral.
Explanation:
I'm doing the assignment myself. Look up the answers and use common logic.
Answer and I will give you brainiliest
heeeeelp PLZ
In the testes, sperm cells replicate and differentiate in the _________. Question 2 options: urethra septum tunica albuginea seminiferous tubules ductus deferens
Answer:
seminiferous tubules
Explanation:
Seminiferous tubules are coiled tubes where sperm cells are produced by a process referred to as spermatogenesis. These tubes are located in the testes or testicles (i.e., male reproductive glands/gonads). Each testicle contains approximately 250 compartments known as testicular lobules, while each testicular lobule has 1 to 4 seminiferous tubules which converge to form a single straight tubule. Once sperm cells mature, they travel through the seminiferous tubules to be stored in a coiled tube called the epididymis.
1. A dominant gene (A) causes yellow color in rats, the dominant allele on another independent gene (R) produces black coat color. When the two dominants occur together (A_ R_) they interact to produce gray coat color. Rats of the genotype aa are cream-colored. If a gray male and a yellow female, when mated, produce offspring approximately 3/8 of which are yellow, 3/8 gray and 1/8 cream, and 1/8 black, what are the genotypes of the parents
Answer:
Parents: Yellow (Aarr) and Grey (AaRr)
Explanation:
Given:
allele A = yellow
allele R = black,
Heteroozygous = gray
Genotypes of the parents:
yellow (Aarr) - female
gray (AaRr) - gray
cross between these
Parents: Yellow (Aarr) and Grey (AaRr)
Gametes: (Ar, ar) and (AR, Ar, aR, ar)
F1 (Punnet square)
----|----- AR ------|------- Ar ------|------ aR -----|----- ar
Ar | AARr (gray) | AArr (yellow) | AaRr (gray) | Aarr (yellow)
ar | AaRr (gray) | Aarr (yellow) | aaRr (black) | aarr (cream)
Ratio: 3/8 yellow : 3/8 gray : 1/8 cream : 1/8 black
hypothesis on what is the effect of the genes of the parental mice on the fur color of the offspring mice? use "If...then...format
Answer:
If the GENES of the parental mice encodes for a black fur, THEN the FUR COLOR of one of the offspring mice will be black.
Explanation:
Hypothesis is one of the steps used in the scientific method. It is a testable explanation of a given question or observation. Hypothesis in an experiment must be subjected to testing via experimentation in order to determine whether to reject it or not.
Hypothesis is usually constructed in the IF, THEN format. It tells us how the independent variable (cause) affects the dependent variable (outcome). In this case, a question is asked this: "what is the effect of the genes of the parental mice on the fur color of the offspring mice?"
A possible hypothesis will be: If the GENES of the parental mice encodes a black fur, THEN the FUR COLOR of one of the offspring mice will be black.
Answer:
A. If either parent mouse passes a dominant allele, the offspring will have black fur.
Explanation:
Either option is correct because it didn't show any green check. It determines on what hypothesis you wrote. I chose A because it relates to my statement. <33
What does the axon of a neuron do?
A
protect the dendrites
B
carry signals away from the soma
C
insulate the myelin sheath
D
process the information it receives
Some one help me please ASAP !
Answer: model 3 answer, choice C
Explanation: A compound is a mix of two or more elements so then your answer is narrowed down to C and D. And now you have to see which one correctly identifies the definition of a compound. So now you have to see which one correctly identifies the definition of a compound. So your answer is model 3.
how do buffers work in the human body?
Answer: They can help prevent a deadly change in blood pH. They can help keep blood below pH 7.0. They can help keep blood at a pH of 7.0.
Explanation:
Here is a pedigree for colorblind (H)
What is fred's genotype?
Answer:
[tex]x^{h} y[/tex]
Explanation:
Fred has inherited the colorblind trait from his mother. We know this because his spot on the pedigree is filled in. Because he is a male his genotype must be some variation of xy and because he is colorblind he must have the recessive "h" on his x chromosome. So his genotype (genetic type) is [tex]x^{h} y[/tex]
Which of the following is true about soil color? a. Soil vary in color based on their mineral content. b. Soils do not vary in color based on their minimal content. c. Soils consisting of only a few minerals are always darker. d. Soils is consisting of many different minerals are always darker.
Answer:
A
Explanation:
cant explain gtg
Answer:A
Explanation:
The pathophysiology of osteomalacia involves a. collagen breakdown in the bone matrix. b. inadequate mineralization in the osteoid. c. crowding of cells in the osteoid. d. increased osteoclast activity.
Answer:
The correct answer is - b. inadequate mineralization in the osteoid.
Explanation:
Osteomalacia is a condition where the bones become weak and soft, this bone softening is occurred due to mainly vitamin D deficiency that also causes rickets. It leads to insufficient or inadequate mineralization in the osteoid.
This conditing when takes place in kids and young adult leads to curve or bowing during the growth period. In this case, bones are very prone or easily fractured.
how is cancer cell division different from regular cell division
1. Below is a diagram of the male
reproductive system. Which structure is
represented by D?
A. scrotum
B. testes
C. prostate gland
D. epididymis
Answer:
A:scrotum
Explanation:
its part of the male reproductive system. I looked it up.
What should Brenda do when a patient wants to make payments on an outstanding patient account balance?
Answer:
Brenda should facilitate the patient's resolve to make the payments by ensuring that an effective schedule is worked out with the patient and that the patient is able to stick to the agreed schedule.
Explanation:
Brenda should always make sure that patients are encouraged to make good on their promises to pay for their medical treatment. She should be compassionate with the patient by showing understanding and sharing information on payment terms. She should be very creative in scheduling payments in such a way as to ensure that the patient makes payments as scheduled. She can even work out some fees for late payments to encourage the patient to stick to the schedule.
The time it takes an object to go around another object (one year) is
Answer:
365 days
Explanation:
How do mutations affect natural selection
Answer:
The idea of natural selection would in theory be affected by mutations because natural selection invloves a species/animal only surviving by having a certain trait. Over time, all of the animals/species would have this trait through elimination partnered with reproduction. A mutation may begin this cycle by giving an animal the ability to have an advantage over its fellow species.
Explanation:
Answer:
They affect how likely an organism is to survive and reproduce
Explanation:
What would be the expected response to a skin injury if the involved tissue had lost the normal cell characteristic of contact inhibition
Answer:
uncontrolled excessive growth of cells in the tissue
Explanation:
Contact inhibition is a cellular mechanism where cell growth is arrested when adjacent cells are in contact with each other. Contact inhibition serves to arrest further cell growth beyond a monolayer, by limiting the migration and/or proliferation of cells in a tissue or organ. In consequence, contact inhibition is critical for normal cells to stop proliferating. When contact inhibition is disrupted, cells undergo uncontrolled growth, which leads to the development of cancer and tumor progression.
Which type of cell are found in the leaves of a tree?
O eukaryotic animal
O chloroplastic
O prokaryotic
O eukaryotic plant
Answer:
Palisade parenchyma cells
Explanation:
Palisade parenchyma cells are elogated cells located in many leaves just below the epidermal tissue. Spongy mesophyll cells occur below the one or two layers of palisade cells. Ray parenchyma cells occur in wood rays, the structures that transport materials laterally within a woody stem.
Answer:
eukaryotic plant
Explanation:Unit 2 Test: Cells
Humans always have a negative impact on the environment.
Please select the best answer from the choices provided
T
F
Need help will mark Brainliest
Answer: the secondary response to Antigen A is greater because the lymphocytes remember the antigen
Which of the following is a true statement?
The oceans replenish groundwater.
Lakes are only found in the Northern Hemisphere.
Coral reefs and sandbars create lagoons.
The oceans provide water for rivers and streams.
Answer:
Coral reefs and sandbars create lagoons.
Explanation:
↑↑↑↑↑↑ the one above is the answer
True or False: A neuron's response is all-or-nothing.
Answer:
TRUE
Explanation:The all-or-none law is a principle that states that the strength of a response of a nerve cell or muscle fiber is not dependent upon the strength of the stimulus. ... Essentially, there will either be a full response or there will be no response at all for an individual neuron or muscle fiber.
Answer: True
Explanation:
The F1 mother of these progeny (F2) resulted from a cross between two flies from true breeding lines (P generation). What are the genotypes of these two lines
The question is incomplete. The complete question is :
In fruit flies, the recessive pr and cn mutations cause brown and bright-red eyes, respectively (wild-type flies have brick-red eyes). The double mutant pr cn combination has orange eyes. A female who has wild-type eyes is crossed to an orange-eyed male. Their progeny have the following distribution of eye colors:
wild-type8
brown241
bright-red239
orange12
500
The F1 mother of these progeny (F2) resulted from a cross between two flies from true breeding lines (P generation). What are the genotypes of these two lines ?
Answer:
prprcn+cn+ and pr+pr+cncn
Explanation:
Progeny is the offspring or descendants of any animal, plant, human or a species.
In the context, it is given that the cn mutation and recessive pr in the fruit flies makes brown and bright red color eyes. And the double mutant of pr and cn combination makes orange eyes. An oragne eye males is crossed with a female having a wild type eyes. Now for this, the F1 mother of the progeny F2 which results from the cross of two flies, the genotypes is " prprcn+cn+ and pr+pr+cncn. "
The amount of sunlight reflected from the Moon to Earth is what characterizes the Moon’s appearance. During which phase would the Moon be farthest away from the Sun?
What limits the growth of phytoplankton?
Answer:
phosphorus has been considered to be the primary nutrient limiting phytoplankton growth in freshwater ecosystems
Explanation:
Why are the digestive systems of birds, ruminants and humans different?
Answer:
Humans and many other animals have monogastric digestive systems with a single-chambered stomach. Birds have evolved a digestive system that includes a gizzard where the food is crushed into smaller pieces.
Explanation:
Answer:
The digestion process in Ruminants is completely different from humans.
This is because the digestion process in Ruminants begins by chewing and swallowing its food. The main diet for these animals includes grass, leaves and other parts of plants.