Genetics and Heredity — Test

Question 17 • Biology

Which Punnett square represents a cross between two parents that are heterozygous for purple flowers?

Answer

Image with description A Punnett square is shown. The columns are labeled Upper F and Upper F. The rows are labeled Upper F and f. Clockwise from upper left the boxes contain: Upper F Upper F, Upper F Upper F, Upper F f, Upper F f.

Image with description A Punnett square is shown. The columns are labeled Upper F and f. The rows are labeled Upper F and f. Clockwise from upper left the boxes contain: Upper F Upper F, Upper F f, Upper F f, f f.

Image with description A Punnett square is shown. The columns are labeled f and f. The rows are labeled f and f. Clockwise from upper left the boxes contain: f f, f f, f f, f f.

Explanation

A heterozygous parent has one dominant allele and one recessive allele, so each parent’s genotype is Ff. The Punnett square must therefore have F and f across the top and F and f down the side, as in choice C. Its offspring genotypes are FF, Ff, Ff, and ff.

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