McGraw-Hill Online Learning Center Test

McGraw-Hill Online Learning Center Test


1. Review the image and answer the following questions.

Does crossing two plants, each heterozygous for two traits, always produce a phenotypic ratio of 9:3:3:1 in the offspring?

A. Yes, unless there are linked genes, incomplete dominance, or, in animals, sex chromosomes involved.
B. Yes, regardless of the situation.
C. No, because the results of each cross are completely random.
D. None of these is correct.


2. With what would the researcher need to cross the F1 generation in order to yield a 1:1:1:1 phenotypic ratio in the F2 generation?

A. a pea plant heterozygous for both traits
B. a pea plant homozygous recessive for one trait, heterozygous for the other
C. a pea plant homozygous recessive for both traits
D. None of the above.
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