4 (two points) A female Drosophila with a yellow body and white eyes is crossed

Question

4 (two points) A female Drosophila with a yellow body and white eyes is crossed with a male that has normal (tan) body color and normal (red) eyes. Both lines are true-breeding. The resulting offspring are as follows. All females have normal (tan) bodies and normal (tan) eyes, all males have yellow bodies and white eyes What genetic interaction seems to be the case here? Based on these results alone, can you tell if yellow bodies and white eyes are caused by one, or two loci? a) Now, imagine that the F1 females from the above cross is crossed to the males with yellow bodies and white eyes. The resulting F2 offspring are as follows. Females 45 Yellow body white eyes MALES 44 Yellow body white eyes 6 Yellow body red eyes 3 Tan body white eyes 47 Tan body red eyes 5 Yellow body red eyes 5 Tan body white eyes 45 Tan body red eyes

Explanation / Answer

Answer:

Given result is: males have yellow bodies and white eyes and females with normal body and eyes. This means that the genes for body color and eyes are X-linked. Males have only one X-chromosome.

The male has normal body and normal eyes, so, its genotype will be (XTR).

Females have two X-chromosomes. The female has yellow body and white eyes, so, its genotype will be (XtrXtr).

The cross is: XtrXtr crossed to XTR

Females will have the resulting genotype XTR Xtr. So, its phenotype is normal body and eyes.

Males will have the genotype Xtr. So, its genotype will be yellow body and white eyes.

Answer 1.

This type of interaction is known as X-linked interaction.   

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