inance relationship at a second locus determine whether the tail is curly or straight. Define the straight tail and U for a curly tail. ner Baldridge has two unicorns with curly tails. When he crosses them, one-half of the progeny straight tails, and one-quarter do not have a tail. hat are the genotypes of the parents at the tail-presence gene? TT X TT TT x tt Tt x Tt Tt x tt tt X tt What are the genotypes of the parents at the tail-texture gene? U XU U DUU³xU²U² QUUXUU SC QU'UºXUºUº S )ƯU XƯU SS ce the unicorn genotype or genotypes below each unicorn phenotype in the pedigree. Some unicorn pl lt of more than one genotype.

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Suppose that 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 no tail, t. If a unicorn has a tail, then alleles with an unknown
dominance relationship at a second locus determine whether the tail is curly or straight. Define the alleles for tail texture as U
for a straight tail and U for a curly tail.
S
Farmer Baldridge has two unicorns with curly tails. When he crosses them, one-half of the progeny have curly tails, one-quarter
have straight tails, and one-quarter do not have a tail.
What are the genotypes of the parents at the tail-presence gene?
TT X TT
TT x tt
Tt x Tt
Tt x tt
tt x tt
What are the genotypes of the parents at the tail-texture gene?
SC
SC
OU'U XU³UC
сс
OU'U' xU°U
C C C C
OU°UXU°Uº
ƯU
QU'U XU U
C
сс
SS
SS
OUU³XU³U³
Place the unicorn genotype or genotypes below each unicorn phenotype in the pedigree. Some unicorn phenotypes may be the
result of more than one genotype.
TT U U
tt U U
Tt U U
TTU U
Answer Bank
Tt U U
Tt U U
TT U U
tt U U
tt U U
Transcribed Image Text:Suppose that 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 no tail, t. If a unicorn has a tail, then alleles with an unknown dominance relationship at a second locus determine whether the tail is curly or straight. Define the alleles for tail texture as U for a straight tail and U for a curly tail. S Farmer Baldridge has two unicorns with curly tails. When he crosses them, one-half of the progeny have curly tails, one-quarter have straight tails, and one-quarter do not have a tail. What are the genotypes of the parents at the tail-presence gene? TT X TT TT x tt Tt x Tt Tt x tt tt x tt What are the genotypes of the parents at the tail-texture gene? SC SC OU'U XU³UC сс OU'U' xU°U C C C C OU°UXU°Uº ƯU QU'U XU U C сс SS SS OUU³XU³U³ Place the unicorn genotype or genotypes below each unicorn phenotype in the pedigree. Some unicorn phenotypes may be the result of more than one genotype. TT U U tt U U Tt U U TTU U Answer Bank Tt U U Tt U U TT U U tt U U tt U U
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