Question

the punnett square below shows a cross between two guinea pigs. short hair (r) is a dominant trait while long hair (r) is a recessive trait. choose a word from the drop - down menu for each blank to complete the sentences below. the punnett square above shows a cross between. once the cross is completed, of the offspring will have short hair, while of the offspring will show the recessive trait of long hair. the genotypic ratio for the offspring will be.

Explanation:

Step1: Identify parent genotypes

The parents have genotypes Rr (heterozygous) as they have one dominant (R) and one recessive (r) allele.

Step2: Calculate short - haired offspring

Genotypes RR, Rr, Rr result in short hair. There are 3 out of 4 possible genotypes for short hair, so $\frac{3}{4}=75\%$.

Step3: Calculate long - haired offspring

Genotype rr results in long hair. There is 1 out of 4 possible genotypes for long hair, so $\frac{1}{4}=25\%$.

Step4: Determine genotypic ratio

The genotypes are RR:Rr:rr = 1:2:1.

Answer:

1. Heterozygous guinea - pigs
2. 75%
3. 25%
4. 1:2:1