Punnett squares are convenient ways to represent the types and frequencies of gametes and progeny in experimental crosses.
this punnett square shows the results of a yy x yy cross to form f2 progeny.
use your understanding of mendel's law of segregation and the rules of probability to complete the punnett square for this cross.
-first identify the gametes. use pink labels to identify the male and female gamete types and white labels to identify the gamete frequencies.
-then identify the f2 progeny. use pink labels to identify the progeny genotypes and white labels to identify the progeny frequencies.

F2 progeny: 1/4 YY: 1/2 Yy : 1/4 yy

Gamete frequency (for both male and female gametes)= 1/2 Y : 1/2 y

Explanation:

Given that the genotype of the both parents is "Yy", each of the parent would produce two types of gametes. The 1/2 of both the male and female gametes would have "Y" allele while the rest 1/2 would have "y" allele.

This is due to the fact that each gamete carries only one allele for any gene due to segregation of homologous chromosomes to the opposite poles during anaphase I of the meiotic division that forms gametes.

The random fusion of these male and female gametes would given the F2 progeny with genotype frequency= 1/4 YY : 1/2 Yy : 1/4 yy.