Post-UTME Biology 2017 Objective — Question 6
Question 6 of 20 from the Post-UTME Screening (Post-UTME) Biology 2017 Objective paper, with the correct answer and a full explanation.
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In an experiment, two black guinea pigs were crossed and one of the progenies in the F1 generation is brown. Given that black is dominant over brown, which of the following is true of the parents?
- A. Only one of the parents is heterozygous for the trait
- B. Both parents are heterozygous for the traitCorrect
- C. Only one of the parents is homozygous for the trait
- D. Both parents are homozygous for the traits
Explanation
Since both parents show the dominant (black) phenotype but produced a brown (recessive) offspring, both parents must carry the recessive allele, i.e. both are heterozygous (Bb x Bb can yield bb offspring).
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