A Mutant Gene That Produces Brown Eyes Bw Is Located

question 15

Multiple Choice

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. From the information presented above,how many white- eyed flies would you expect in the F₂ generation?

• A)200
• B)450
• C)350
• D)50
• E)150

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