How Do recessive and dominant alleles get filled into a punnet square?

Answer 1

here is an example:

key: dark hair - H (dominant)

light hair - h (recessive)

father: Hh

mother: hh

father's alleles: H & h

mother's alleles: all h

punnet square:

father's

__H____l____h_____

Mothers: h l Hh l hh

The father's dominant H allele combines with the mother's h allele produces Hh

The father's reccesive h allele combins with the mother's h allele produces hh

therefore the possible combinations of alleles are Hh and hh.

1/2 of their children will have dark hair and 1/2 of their children will have light hair