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In a perfectly controlled laboratory environment, a pure-breeding fish with a 23-mm tail...
27
d
In a perfectly controlled laboratory environment, a pure-breeding fish with a 23-mm tail was crossed to a
pure-breeding fish with a 15-mm tail. In the F1, all individuals had tails of an intermediate length: 19 mm.
If tail length is a typical polygenic trait controlled entirely by the equal and additive effect of two
unlinked genes, each with two alleles ("+" and "-"), what phenotypic ratios do you expect to find in the
F2?
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