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3 years ago

PLEASE HELP. I REALLY NEED THIS!!!!

Biology

1 answer:

Viefleur [7K]3 years ago

4 0

Answer:

In nature, populations are usually evolving. The grass in an open meadow, the wolves in a forest, and even the bacteria in a person's body are all natural populations. And all of these populations are likely to be evolving for at least some of their genes. Evolution is happening right here, right now!

To be clear, that doesn't mean these populations are marching towards some final state of perfection. All evolution means is that a population is changing in its genetic makeup over generations. And the changes may be subtle—for instance, in a wolf population, there might be a shift in the frequency of a gene variant for black rather than gray fur. Sometimes, this type of change is due to natural selection. Other times, it comes from migration of new organisms into the population, or from random events—the evolutionary "luck of the draw."

I hope this helps a little bit.

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a man with type ab blood is married to a woman also with type ab blood. what percentage of their children will have

jekas [21]

100% Percent will have ab blood

4 0

3 years ago

An individual that is homozygous dominant for type B blood and little finger shape mates with an individual that is heterozygous

gregori [183]

Answer:

Let "L" be the dominant allele for little finger shape and "l" be the recessive allele for the same.

It is given that a person is homozygous dominant for blood group B and little finger shape. Hence, the genotype would be $I^BI^B$ LL

The other person is heterozygous for blood group A and homozygous recessive for little finger shape. Hence, the genotype would be $I^Aill$

The type of gametes formed by the first parent would be $I^BL$ only.

The type of gametes formed by second parent would be $I^Al$ and il.

The cross is shown in the attached figure.

According to the cross, we get two phenotype:

offspring with blood group AB and dominant little finger shape, and
offspring with blood group group B and dominant little finger shape.
They are present in 4 : 4 = 1 : 1

According to the cross, we get two genotype:

$I^AI^BLl$
$I^BiLl$
They are also present in 4 : 4 = 1 : 1.

5 0

3 years ago

Choose all the answers that apply.

olganol [36]

i think it is b d and or e

4 0

3 years ago

You compare them to see what is different. Sample 1: ATTACAGTACTGGCA Sample 2: ATTACAATACTGGGCA

shtirl [24]

Answer: A gene mutation.

8 0

4 years ago

Suppose the femur bone of an animal has 1,000 atoms of carbon-14 when the animal dies. How many atoms of carbon 14 will be prese

shtirl [24]

Answer:

After 6000 years, approximately 500 atoms of carbon-14 will be left in the femur bone of an animal which had 1000 atoms of carbon-14 when the animal died.

Explanation:

The half-life of a radioactive isotope of an element is the time taken for half the atoms present in a given amount of the element to undergo decay or disintegration. For example, the half-life of carbon-14 isotope is 5730 years. This means that, if there are 100 atoms of carbon-14 present in a given sample of a material, in the next 5730 years, approximately, 50 atoms of carbon-14 will be left in the material.

Since the half-life of radioactive isotopes are constant, these radioactive isotopes are used in the determining the ages of ancient life-forms as well as rocks.

In the given example, after 6000 years, approximately 500 atoms of carbon-14 will be left in the femur bone of an animal which had 1000 atoms of carbon-14 when the animal died.

8 0

3 years ago