In fruit flies, the allele for red eyes, r, is dominant. which genotype represents a white-eyed male fruit fly?

a. xrxr
b. xry
c. xry
d. xrxr

The correct answer would be B. XrY.

In fruit flies, XY codes for males and XX codes for females.

Gene encoding color of eyes is present in X chromosome only and carrier two alleles R and r.

In females, R is a dominant allele that codes for red eyes in homozygous as well as heterozygous condition whereas r is a recessive allele that codes for white eyes when present in homozygous condition only.

In males, only one X chromosome is present. So, if it carries R allele then the fruit fly would exhibit red eyes whereas if it carries r then the fruit fly would exhibit white eyes.

Only two out of four options are male fruit flies: XrY and XRY.

XrY would exhibit white eyes and XRY would exhibit red eyes.

Hence, we can conclude that XrY would be the white-eyed male fruit fly.

step 1 ammonium can be absorbed by plants, but some is converted into nitrates which are better for plants to absorb. this is called nitrification. 2. step 2 the deer eats the plants and uses the nitrogen-containing proteins for cell growth. 3. step 3 bacteria in the soil conduct nitrogen fixation to convert nitrogen gas from the atmosphere into ammonium. 4. step 4 some of the nitrates are absorbed back into plants, but denitrification breaks down the nitrates into nitrogen gas released back into the atmosphere. 5. step 5 nitrogen is found in the urine, which gets broken down into ammonium through the process of ammonification. 6. step 6 plants absorb the ammonium and begin assimilation, the process to add the nitrogen to protein.

it would lead to upper respiratory infections and pneumonia.