Wednesday, August 17, 2011

Genetics question, please help!?

In unicorns, two autosomal loci interact to determine the type of tail. One locus controls whether a tail is present at all, the allele for a tail (T) is dominant over the allele for tailless (t). If a unicorn has a tail, then alleles at a second locus determine whether the tail is curly or straight. Farmer Baldridge from Wewoka, Oklahoma has two unicorns with curly tails. When he crosses these two unicorns, � of the progeny have curly tails, � have straight tails, and � do not have tails. Give the genotypes of the parents and progeny in Farmer Baldridges cross and explain how he obtained the 2:1:1 phenotypic ratio in his cross.

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