In guinea pigs, rough coats (with lots of swirly cowlicks) are dominant over smooth coats. If a male homozygous dominant guinea pig is crossed with a female heterozygous guinea pig, what are the possible genotypes and phenotypes of the offspring? Complete the Punnett square and the percentages of rough and smooth coated offspring.
***Please follow all Punnett square rules to complete this question. (Letters and numbers, only)
Please use the following: Rough = R and Smooth = r
offspring 1 offspring 2 Rr
offspring 3 Rr offspring 4 Rr
% rough
% smooth
To complete the Punnett square, we can use the genotypes of the parents: the male is homozygous dominant (RR) and the female is heterozygous (Rr). We can write the genotypes of the offspring in the squares of the Punnett square.
Punnett square:
| R | r |
---------------------
R | RR | Rr |
---------------------
R | RR | Rr |
Possible genotypes of the offspring:
- Offspring 1: RR
- Offspring 2: Rr
- Offspring 3: Rr
- Offspring 4: Rr
To determine the possible phenotypes of the offspring, we can refer to the information given in the question.
Phenotypes:
- Rough coat (RR or Rr): Offspring 1, Offspring 2, Offspring 3, Offspring 4
Percentages:
- % rough coat: 100%
- % smooth coat: 0%