Which chart shows all the possible combinations of alleles that can result from a genetic cross?

• A. Genome Map
• B. Punnett Square
• C. Pedigree
• D. Karyotype

Answer: (B)

A Punnett square shows all the possible combinations of alleles that can result from a genetic cross. It works by listing the alleles a parent can pass on along the top and side, then filling in the grid to reveal every possible pairing in the offspring. This visualization makes it easy to see both the possible genotypes and the probabilities of different phenotypes that could appear in the next generation. It also illustrates how the two alleles for a gene segregate into gametes and then recombine during fertilization.

Other charts serve different purposes: a genome map indicates where genes are located on chromosomes, a pedigree tracks how traits pass through a family across generations, and a karyotype shows the full set and structure of an individual’s chromosomes. For showing all possible allele combinations from a cross, the Punnett square is the right tool.