Download PUNENTT SQUARES #2

PUNENTT SQUARES #2
1. A male with a heterozygous genotype for a large nose marries a female with a small nose. What are
the chances this couple will have children with a large nose? Small nose?
Cross:
ratios:
Punnett square:
2. A make who is homozygous dominant for hairy arms marries a female with a heterozygous genotype
for hairy arms. What is the chance their children will have hairy or non-hairy arms?
Cross:
ratios:
Punnett square:
3. A homozygous dominant for long eyelashes male marries a female with short eyelashes. What are
the chances that the children will have long or short eyelashes?
Cross:
ratios:
Punnett square:
4. A homozygous dominant normal chin female marries a heterozygous normal chin male. What are the
chances the children will have normal or cleft chin?
Cross:
Punnett Square:
ratios:
5. A heterozygous male with freckles marries a female with no freckles. What are the chances their
children will have freckles or no freckles?
Cross:
ratios:
Punnett Square:
6. Figure out the genotype and phenotype ratio for the following crosses:
a. homozygous dominant X homozygous dominant
Punnett square:
genotype ratio:
Phenotype ratio:
b. homozygous dominant X heterozygous
Punnett square:
genotype ratio:
Phenotype ratio:
c. homozygous dominant X homozygous recessive
Punnett square:
genotype ratio:
Phenotype ratio:
d.
heterozygous X heterozygous
Punnett square:
genotype ratio:
Phenotype ratio:
e. heterozygous X homozygous recessive
Punnett square:
genotype ratio:
Phenotype ratio:
f. homozygous recessive X homozygous recessive
Punnett square:
genotype ratio:
Phenotype ratio:
Dihybrid Cross
1. In guinea pigs, rough coat is dominant to smooth coat and black is dominant to albino. A heterozygous
black, smooth male is bred to a heterozygous black rough female. Show the cross and Punnett square along
with the phenotype ratios.