In the F₂ of a dihybrid cross (AaBb × AaBb), what fraction of offspring is homozygous for both genes?
Correct answer B. 1/4
Topic / 48 questions
Inheritance MCQs
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- Biological Molecules 74
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How many different genotypes appear in the F₂ of a dihybrid cross between two AaBb plants?
Correct answer C. 9
How many genetically different gametes can a plant of genotype AaBbCc produce if the genes are unlinked?
Correct answer C. 8
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When AaBbCc is self-fertilised (genes unlinked, complete dominance), what fraction of offspring show all three dominant traits?
Correct answer B. 27/64
Two parents are both heterozygous (Aa) for a recessive condition. What is the probability that their first child is affected (aa)?
Correct answer A. 1/4
Two heterozygous tall pea plants (Tt × Tt) produce three offspring. What is the probability that all three are tall?
Correct answer D. 27/64
Two carriers (Aa × Aa) of a recessive trait have two children. What is the probability that at least one child is aa?
Correct answer B. 7/16
In the cross AaBb × aaBb (genes unlinked), what fraction of offspring is expected to be aabb?
Correct answer D. 1/8