What is the purpose of a Punnett grid in genetics?

A Punnett grid serves primarily to illustrate the possible genetic combinations that can occur when two parent organisms breed. By filling out the grid with the alleles from each parent, it becomes a visual representation that allows one to predict the potential phenotypes—observable traits—of the offspring. Each cell in the grid corresponds to a possible genotype for the offspring, and from these genotypes, the phenotypic ratios can be derived.

This tool does not delve into gene sequences, meaning that the first choice regarding calculating gene sequences does not align with the function of a Punnett grid. While it helps in understanding inheritance patterns, the grid specifically excels in determining the frequencies of phenotypes rather than tracking the broader aspects of inheritance patterns or mutational changes. Therefore, the emphasis on phenotypic frequencies reflects the correct recognition of the grid’s purpose in genetic predictions and studies.