In guinea pigs, the allele for a rough coat (R) is dominant over the allele for a smooth coat (r). A heterozygous guinae pig (Rr) and a homozygous recessive guinea pig (rr) have a total of nine offspring. The punnett square for this cross shows a 50 percent chance that any particular offspring will have smooth coats. Explain how all nine offspring can have smooth coats.

Question

In guinea pigs, the allele for a rough coat (R) is dominant over the allele for a smooth coat (r). A heterozygous guinae pig (Rr) and a homozygous recessive guinea pig (rr) have a total of nine offspring.  The punnett square for this cross shows a 50 percent chance that any particular offspring will have smooth coats.  Explain how all nine offspring can have smooth coats.

PsyDAG · Answer

It would a significant deviation from chance {(1/2)^9}, but it is possible. Are r-bearing sperm faster swimmers?

Anaya Baker · Answer

In guinea pigs, rough coats (with lots of swirly cowlicks) are dominant over smooth cats. If a male homozygous recessive guinea pig is crossed with a female homozygous dominant 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