Suppose that the scalloped gene was an autosomal recessive gene, rather than an

Question

Suppose that the scalloped gene was an autosomal recessive gene, rather than an X-linked recessive gene. What results would you now expect from the parental cross in Part A: scalloped female × normal male (homozygous)

Select one true statement about the F1 AND one true statement about the F2.

All F1 offspring would be normal. All F1 offspring would be scalloped. The F1 offspring would include both scalloped and normal flies of both sexes. The F2 offspring would be in a 3:1 ratio of normal to scalloped flies. The F2 offspring would be in a 1:3 ratio of normal to scalloped flies.

Explanation / Answer

The correct answer about F1 about that all F1 offspring will be normal because it is autosomal gene, so we can't tell about which sex will be affected

F1 will be Aa and for F2, the cross will be Aa x Aa and resulting F2 will be AA, Aa, Aa and aa, which will be 3:1 for normal and scalloped  

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