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.

Genes code for proteins. A slight difference in the DNA sequence will have an effect on the sequence of RNA and the sequence of the resulting protein, affecting the whole structure and function of the protein. Since they are usually two copies of alleles for each gene and many genes may be involved in determining a single phenotypic trait, it is the gene expression or genotype that determines phenotype. Overall, if there is a mutation in the polypeptide chain, it is going to affect the protein and the resulting phenotype of a particular trait.

Explanation / Answer

R stands for dominant brown and W stands for recessive white

Result of the cross is as follows-

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