Answer:
They represent the genotypes.
Explanation:
The letters on the top and the side of a punnett square represent the genotype of the species.
The letters on the top and the side of the Punnett square represent the ALLELES that are inherited from each gamete (sperm or egg).
The Punnett square is a diagram used in genetics to predict the genotypes obtained from a particular cross.
During fertilization, haploid gametes (sperm or egg) fuse to form a zygote.
Each gamete cell carries one copy of each gene variant or allele for a given locus, thereby one individual received one allele from the mother and receives the other allele from the father.
The letters in a Punnett square represent these alleles, which combine to form a particular genotype in offspring.
In conclusion, the letters on the top and the side of the Punnett square represent the ALLELES that are inherited from each gamete (sperm or egg).
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