The results of our eye chromatography experiment confirmed that there are 2 gene

Question

The results of our eye chromatography experiment confirmed that there are 2 genes that control eye color in our strains of fruit flies. One gene codes for the presences of enzyme #1 and white eyed flies produce only a non-functional form of this enzyme. The other gene codes for enzyme #3, and sepia flies produce a non-function form this enzyme.

white is recessive and brown is dominant

Let’s suppose that there are 2 alleles for each of the genes that code for each of the enzymes involved in fruit fly eye (one dominant, the other recessive). Also let’s assume for now that alleles that code for non-functional enzymes are recessive in each case. Based on this, what would be the predicted phenotype of a fruit fly that is heterozygous at each of the genes that you have proposed would affect eye color? Explain!

What would be the predicted phenotype of a fruit fly that is homozygous recessive at one of the genes that you have proposed would affect eye color (assume the fly is heterozygous or homozygous dominant at the other gene(s)? Explain!

What would be the predicted phenotype of a fruit fly that is homozygous recessive at the other gene that you have proposed affects eye color (again, assume the fly is heterozygous or homozygous dominant at the other gene(s)?

Do the genes interact in some way? Explain how using your knowledge of the relationship between genotype, the protein products of genes and the resulting phenotype.

Explanation / Answer

Based on the given data,

Therefore, if the enzyme-1 is not expressed, then color of the eye is white and if the enzyme-3 is not expressed, then color of the eye is brown. For example, consider the following gene symbols for the enzyme-1 and enzyme -3.

Here, white is recessive and brown is dominant phenotype, so the genotypes are:

White:

Brown:

1)

As brown is the dominant phenotype and #3 enzyme has no role in eye color expression. Thus, the predicted phenotype of a fruit fly that is heterozygous at each of the genes that you have proposed would affect eye color is:

Brown: A1a1 A3a3

2)

White:

3)

Brown:

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