Question

In another laboratory a short haired guinea pig is crossed with a long haired one and not a single offspring has long hair. Show the cross that explains the situation

Answer 1

See the answer below

Step-by-step explanation:

11. For none of the offspring have had long hair, it means the long hair allele is recessive to the short hair allele. Let us assume the short hair allele to be A and the long hair allele to be a. The short hair guinea pig would be homzygous with AA genotype and the long hair would have aa genotype.

AA x aa

Aa Aa Aa Aa

Due to the fact that A is dominant over a, all the offspring would have short hair. See the FIRST attached image for the Punnet's square analysis.

12. The second attached image shows the cross between homzygous curly hair guinea pigs (GG). All the offspring would be with curly hair. The percentage is, therefore, 100%.