In fruit flies, the gene for eye color is located on the X chromosome, and the red eye allele (R) is dominant

Biology

1 answer:

aliya0001 [1]3 years ago

3 0

Answer:

b. The chance of an offspring having white eyes is 50%

Explanation:

So the genotype of the male fly is X^r Y. This means the male has white eyes because he only has one X chromosome, so he will express whatever allele is on that chromosome.

The genotype of the female fly, though, is X^R X^r. This is because carriers are heterozygous for traits, and the sex chromosomes of most females is XX (with some exceptions, like XXX, or X (Turner syndrome)).

If we cross this, what are the outcomes? Do a Punnett square. You get the genotypes of X^r X^R, X^r X^r, X^R Y, and X^r Y. The expected phenotypes are a red eye female, white eye female, red eye male, and white eye male.

Now, let's look at the choices:

A.: The chance of an offspring having red eyes is not 75%; it is 50%.

B.: The chance of an offspring having white eyes is 50%!!!

C.: The chance that a male offspring will have white eyes is 50%, not 0%.

D.: The chance that a male offspring will have white eyes is 50%, not 100%.

Sooo, it's B!

You might be interested in

What structure is found outside the cell membrane and provides protections and support to the cell?

Lyrx [107]

I believe that would be the cell wall

6 0

2 years ago

Read 2 more answers

What substance is a pure substance ?

denis-greek [22]

<span>Hello,

Silver is a pure substance, So B is your answer!

Have a good day mate !!!

Your Friend --- Young Sinatra</span>

5 0

2 years ago

A group of biology students tests the growth of bacteria under different conditions. The students apply the same amount of bacte

frez [133]

C because it is i did it

4 0

2 years ago

1. Write a paragraph of 3-5 sentences to answer the following question. Your answer should demonstrate an understanding of the i

nignag [31]

Answer:

When you sit on a plane for 6 hours without moving, blood accumulates in your veins, and the moment you get up, gravitational forces affect venous return, cardiac output, blood pressure, and venous pressure. That way, when you're sitting on a plane, the gravitational force is the same at the upper and lower extremities, such as the chest, abdomen, and legs, causing venous blood pressure and volume to be evenly distributed throughout the body. However, when one gets up, one becomes dizzy because of abnormal regulation of blood pressure. This is because gravity causes blood to accumulate in the lower extremities (veins of the legs and trunk). This lowers the blood pressure and the blood that the heart pumps. By causing blood to accumulate in the lower extremities, and as venous compliance increases, the veins expand with blood that causes the volume of blood to shift in the veins. This increases the volume and venous pressure in the lower extremities when standing. And the volume of thoracic venous blood is less and less central venous pressure. This leads to a decline in stroke volume. Cardiac output and mean arterial pressure also decrease as left ventricular stroke volume decreases, reducing pulmonary venous return. Decreased standing blood pressure, referred to as orthostatic or postural hypotension. Thus, lowering blood pressure decreases cerebral blood flow, which means less range of blood in the brain causing dizziness.

Explanation:

6 0

3 years ago

In meiosis, one blank cell divides to make four blank cells

Eddi Din [679]

In meiosis, one diploid cell divides to make four haploid cells.

7 0

2 years ago