In hogs a gene that produces a white belt around the
animal's body is dominant over its allele for a uniform
body. Another independent dominant gene produces fusion of
the hoof (syndactyly). Suppose a uniformly colored hog
homozygous for syndactyly is mated with a normal footed hog
homozygous for the belted character. What would be the
phenotype of the F1? If the F1's interbreed, what would be
the phenotypic ratio of the F2?
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People who can roll their tongues contain a dominant allele for tongue rolling. If people do not contain the tongue rolling gene, then they cannot roll their tongue no matter how hard they try. Consider the following situation: If a homozygous dominant tongue roller mates with a homozygous recessive non-tongue roller, then what is the probability of the offspring inheriting the tongue rolling gene?
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