A Mutant Gene That Produces Brown Eyes (Bw)is Located on Chromosome

question 34

Essay

A mutant gene that produces brown eyes (bw)is located on chromosome 2 of Drosophila melanogaster,whereas a mutant gene producing bright red eyes,scarlet (st),is located on chromosome 3.Phenotypically,wild-type flies (with dull red eyes),whose mothers had brown eyes and whose fathers had scarlet eyes,were mated.The 800 offspring possessed the following phenotypes: wild type (dull red),white,scarlet (bright red),and brown.Most of the 800 offspring had wild-type eyes,whereas those with white eyes were the least frequent.
(a)Using standard symbolism,diagram the cross from the P generation (brown-eyed mothers X scarlet-eyed fathers)and the F₁ generation.Be certain to provide the alleles of the mutant genes.
(b)From the information presented above,how many white-eyed flies would you expect in the F₂ generation?

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