AnswersCMS 2026-2027 Biology CREDIT RECOVERYPractice TestQuestion 7
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Question 7 • CMS 2026-2027 Biology CREDIT RECOVERY

The Punnett square predicts the ratio of genotypes in the offspring based on the genotypes of the parents. Which Punnett square represents a cross between a mom who is heterozygous for dimples and a dad who is homozygous for no dimples?

Answer
A
Image with description Square divided into four equal sections forming a 2 by 2 grid. Columns labeled uppercase D and lowercase d. Rows labeled lowercase d and lowercase d. Top row: uppercase D lowercase d, lowercase d lowercase d. Bottom row: uppercase D lowercase d, lowercase d lowercase d.
B
Image with description Square divided into four equal sections forming a 2 by 2 grid. Columns labeled uppercase D and uppercase D. Rows labeled lowercase d and lowercase d. Top row: uppercase D lowercase d, uppercase D lowercase d. Bottom row: uppercase D lowercase d, uppercase D lowercase d.
C
Image with description Square divided into four equal sections forming a 2 by 2 grid. Columns labeled uppercase D and lowercase d. Rows labeled uppercase D and lowercase d. Top row: uppercase D uppercase D, uppercase D lowercase d. Bottom row: uppercase D lowercase d, lowercase d lowercase d.
D
Image with description Square divided into four equal sections forming a 2 by 2 grid. Columns labeled uppercase D and uppercase D. Rows labeled uppercase D and uppercase D. Top row: uppercase D uppercase D, uppercase D uppercase D. Bottom row: uppercase D uppercase D, uppercase D uppercase D.

Explanation

A heterozygous mom has genotype Dd, so her eggs can carry either D or d. A dad homozygous for no dimples has genotype dd, so every sperm carries d. The Punnett square therefore has columns D and d and rows d and d, producing two Dd offspring and two dd offspring; this matches choice A.

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