Question

Parents that are heterozygous for having freckles (dominant) are crossed. Which represents the ratio of their offspring?

Twenty-five percent have freckles.
Twenty-five percent are Ff.
Seventy-five percent have freckles.
Seventy-five percent are Ff.

Answer 1

THE ANSW IS C

Step-by-step explanation:

I TOOK THE TEST

Answer 2

Seventy-five percent (75%) have freckles.

Step-by-step explanation:

This is a cross involving a single gene coding for possession or not of freckles in humans. According to the question, possessing freckles (allele F) is dominant over not possessing it (allele f). Therefore, a heterozygous human will have a Ff genotype and possess freckles.

Crossing two heterozygous parents will result in four possible offsprings as follows: 1 offspring will be homozygous dominant (FF), 2 offsprings will be heterozygous dominant (Ff), 1 offspring will be homozygous recessive (ff). The two dominant offsprings i.e. 3 of the offsprings (FF and Ff) will phenotypically possess freckles, Hence, the percentage of offsprings that have freckes is 3/4 × 100 = 75%. (See attached image)