Which tool is used to show all possible genotypes of a genetic cross?

• A. Punnet Square
• B. Pedigree Chart
• C. Gel Electrophoresis
• D. Karyotype

Answer: (A)

Predicting all possible genotypes from a cross is shown most directly by a Punnett square. It lays out the alleles each parent can contribute as gametes on two axes and then fills in every possible allele combination in the offspring. This gives a complete view of all genotype possibilities and their relative frequencies, which is exactly what’s being asked.

Pedigree charts map how traits run through families and show phenotypes across generations, not every possible genotype for a single cross. Gel electrophoresis separates DNA fragments to analyze size differences, not to predict genotype combos from a cross. A karyotype looks at chromosome number and structure, again not the specific gene-level combinations produced by mating.