Question

in guinea pigs, the allele for short hair is dominant to long hair. s=short, s=long

1. what genotype would a heterozygous short haired guinea pig have?
2. what genotype would a homozygous short haired guinea pig have?
3. what genotype would a long-haired guinea pig have?
4. show the cross for two heterozygous guinea pigs.

1. what percentage of the offspring will have short hair? long hair?

Explanation:

Question 18

Heterozygous means having two different alleles for a trait. Since short hair (S) is dominant over long hair (s), a heterozygous short - haired guinea pig will have one dominant (S) and one recessive (s) allele.

Homozygous means having two identical alleles for a trait. For a homozygous short - haired guinea pig, since short hair is dominant, it will have two dominant alleles (S).

Long hair is a recessive trait. A recessive trait is only expressed when an organism has two recessive alleles. So a long - haired guinea pig must have two recessive alleles (s).

Answer:

Ss

Question 19