female poodle with green eyes (recessive) and yellow spots on her tongue (recessive) was bred with a male poodle who was the wild-type phenotype but hybrid genotype for those same two traits. In a series of litters, this breeding pair gave birth to the following 85 puppies: 39 Normal eyes, normal tongue 36 Green eyes, yellow-spot tongue 6 Green eyes, normal tongue 4 Normal eyes, yellow-spot tongue a.) Use the symbols grn and grn+ for the green eyes gene, and yel and yel for the yellow tongue gene and give the genotypes of the parents of this cross. (Remember, each parent has two alleles for each gene.) b.) Now give the expected genotypes of the offspring. c.) If these two genes were unlinked, given the way the cross was constructed, what ratio would you expect to see among the four categories of offspring shown here? d.) Now match up the expected phenotypes (answer to 2b) with the actual offspring.
.) A female poodle with green eyes (recessive) and yellow spots on her tongue (recessive) was bred
with a male poodle who was the wild-type phenotype but hybrid genotype for those same two traits.
In a series of litters, this breeding pair gave birth to the following 85 puppies:
39 Normal eyes, normal tongue
36 Green eyes, yellow-spot tongue
6 Green eyes, normal tongue
4 Normal eyes, yellow-spot tongue
a.) Use the symbols grn and grn+ for the green eyes gene, and yel and yel for the yellow tongue
gene and give the genotypes of the parents of this cross. (Remember, each parent has two
alleles for each gene.)
b.) Now give the expected genotypes of the offspring.
c.) If these two genes were unlinked, given the way the cross was constructed, what ratio would
you expect to see among the four categories of offspring shown here?
d.) Now match up the expected
e.) Which categories of dogs are “parental types” and which are recombinant types?
f.) Do these two genes appear linked? If so, how far are they from each other (in cM)?
g.) Would a non-crossover (NCO) and a double-crossover (DCO) event look different from each
other in this cross? Why or why not?
h.) If these two genes were very tightly linked, just 0.1 cM away from each other, what is the
most likely outcome of these 85 puppies in terms of the categories above?
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