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nvaldivi2 nvaldivi2
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11 years ago
Suppose that in yellow perch, stripe color is controlled by one gene with two alleles that show incomplete dominance.  The allele E1 produces yellow pigment and allele E2 produces blue pigment.  If we cross a yellow-striped individual with a blue-striped individual, how many of their offspring will be yellow-striped?  Explain.
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#1
11 years ago
From your given info we know that we are crossing an E1E1(yellow) individual with an E2E2 (blue) individual.  In this case, both parents can only give one allele, resulting in an E1E2 first generation offspring.  If this gene is one that exhibits incomplete dominance, none of them will be yellow striped, as they should all be green (or blue AND yellow).
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#2
11 years ago
If this is incomplete dominance and E1=yellow and E2=blue.  The cross is E1E1 x E2E2, and all offspring are E1E2, so there are no yellow offspring.  There are no blue offspring, either.  They are all E1E2, which is a third phenotype (maybe green?).
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