In Drosophila the genes A B D are linked.  You cross a strain that is homozygous for d with a strain that is homozygous for ab.   Below are the phenotypes and progeny of a test cross.  Give the correct order of the genes in the chromosome and determine the map distances between genes. Phenotype       Number                                      ABd                  389      abD                  413      ABD                   60     abd                    68     aBd                    29     AbD                    34     Abd                      3     aBD                      4

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Q: Draw a Punnett square for the dihybrid cross. There are two known alleles of gene occupying a…

A: Dihybrid cross involves two genes in a cross. That's why the two traits are involved in this cross.

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A: As 3 genes are located on the same chromosome then the crossing over event is very rare.

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Q: In which parent and during which meiotic division did non-disjunction occur? If there is more than…

A:

Q: Figure 1. Showing a homologous pair of chromosomes that carry two linked genes. Here we can see that…

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Q: Mutation

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