In cats, long hair is recessive to short hair. A short-haired male is mated to a long-haired female. a) What are all possible genotypes of these two cats? b) What alleles will the gametes of each of these cats contain in their chromosomes? c) What will the kittens from all possible crosses between these two cats look like? d) Two cats are mated. One of the parent cats is long-haired. The litter which results contains two short-haired and three long-haired kittens. What length fur does the second parent have, and what is its genotype?
In cats, long hair is recessive to short hair. A short-haired male is mated to a long-haired female.
a) What are all possible genotypes of these two cats?
b) What alleles will the gametes of each of these cats contain in their chromosomes?
c) What will the kittens from all possible crosses between these two cats look like?
d) Two cats are mated. One of the parent cats is long-haired. The litter which results contains two short-haired and three long-haired kittens. What length fur does the second parent have, and what is its genotype?
Cats also have a locus (gene) for a character called agouti. In cats with agouti fur,
pigment is unevenly distributed (see Fig. 1). The agouti allele is dominant to the allele for regular fur. A male cat who long haired and is heterozygous for agouti fur is crossed with a female who has regular, non-agouti fur and is homozygous for short fur.
a) What are the genotypes of these cats?
b) What are all of the possible allelic combinations in the gametes from each of these cats?
c)What are all of the possible phenotypic combinations of these characters in their kittens and in what ratios?
In mice, black coat color (B) is dominant over brown (b), and a solid pattern (S) is dominant to white-spotted (s). Color and spots are controlled by genes that assort independently. A homozygous black-spotted mouse is crossed with a homozygous brown solid mouse. All of the F1 mice are black and solid.
a)Give the genotypes of the parents and their F1 offspring.
In biology class one day you see a black solid mouse run across your desk. You and your classmates manage to trap the mouse and decide to attempt to discover it’s genotype. In order to do this you perform a testcross with a laboratory mouse.
b) What are the
c) What are ALL of the possible genotypes of the mouse from the classroom?
d) You perform the testcross and find that ½ of the offspring from the testcross is black and solid and ½ are black and spotted. What is the genotype of the classroom mouse?
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