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Home Q & A Board Biology-Related Homework Help Genetics and Developmental Biology
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ijenniferrr ijenniferrr
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12 years ago
Scarlet is a recessive mutant in fruit flies (Drosophila melanogaster) with an orange eye color. You have a wild-type fly that you suspect may be heterozygous for scarlet. If the mutant allele is st and the wild-type allele is st+, what cross would you make to determine if your fly was st/st+ or st+/st+? Predict the results of this cross.
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wrote...
#1
12 years ago
It will be a baby fruit fly
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#2
12 years ago
If you cross your wild type fly with a fly that has orange eyes you could see if any of the progeny have orange eyes.  The cross would be:

st/st+ (the wild type fly) x st+/st+ (the scarlet fly)

The progeny would be:
1/2 wild type (st/st+)
1/2 scarlet (st+/st+)

If half of the progeny have orange eyes, you proved that your wild type fly is heterozygous for scarlet.  If none of the progeny have orange eyes, your fly is not heterozygous.
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