Heredity — Test

Question 9 • 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 2 by 2 Punnett square with column headers uppercase F and lowercase f and row labels uppercase F and lowercase f. The four boxes show FF, Ff, Ff, and ff.

Image with description A 2 by 2 Punnett square with column headers lowercase f and lowercase f and row labels lowercase f and lowercase f. The four boxes show ff, ff, ff, and ff.

Explanation

A heterozygous parent has one dominant allele and one recessive allele, so each parent’s alleles are F and f. Combining those alleles gives FF, Ff, Ff, and ff. Choice D shows this cross; choices A and B do not show both parents contributing an f allele, and C shows two parents with only recessive alleles.

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