2810F10Q4ANS - _ _ Your name Your lab day and room number...

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______________________________ ________________________________ Your name Your lab day and room number or TA name BioGD2810 Genetics Fall 2010 Quiz #4 Four syntenic genes on a Drosophila autosome determine the phenotypes of scutoid bristles, pineapple eye surface, apterous wings, and tipsy behavior (the flies are alcohol sensitive). A single male that is scutoid and apterous is mated with females from a true-breeding stock that is pineapple and tipsy. Two phenotypes, equally distributed among males and females, are seen in the progeny: (1) scutoid, apterous; and (2) pineapple. (a) (2 points) In the box below, briefly explain why there are more than one types of phenotypes among these progeny? That is, why isn't there only a single class? The male was not true-breeding (was a heterozygote for 3 genes). (b) (2 points) In the box below, briefly explain why there are only two classes of progeny, even though there are four genes involved. That is, why aren't there more than two classes of progeny? No crossing over in Drosophila males.
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This note was uploaded on 12/20/2011 for the course BIOGD 6057 taught by Professor Fox during the Spring '09 term at Cornell University (Engineering School).

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2810F10Q4ANS - _ _ Your name Your lab day and room number...

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