In guinea pigs, short hair (H) is dominant to long hair (h). Two heterozygous (hybrid) guinea pigs are crossed. Complete the Punnett Square and analysis.

Given, short hair (H) is dominant to long hair (h). Hence, guinea pigs with HH and Hh genotype will have short hair whereas those with hh genotype will have long hair.

Both the parents are heterozygous (Hh).

When Hh X Hh :

      H      h

H   HH   Hh

h   Hh    hh

Resultant genotype ratio =

1 : 2 : 1 ( HH : Hh : hh )

Resultant phenotype ratio =

3 : 1 ( short hair : long hair )