5
QuizMultiple Choice

Laws of Inheritance

Question 5 • FL-2000310-Biology 1 Sem 1 - Flex

Parents that are heterozygous for having freckles (dominant) are crossed. Which correctly describes their offspring?

Answer
A
Twenty-five percent have freckles.
B
Twenty-five percent are Ff.
C
Seventy-five percent have freckles.
D
Seventy-five percent are Ff.

Explanation

Let F represent the dominant freckles allele and f the allele for no freckles. Crossing two heterozygous parents (Ff × Ff) gives offspring genotypes FF, Ff, Ff, and ff. Three of the four genotypes have at least one F, so 75% of the offspring are expected to have freckles; 50%, not 75%, are Ff.

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