In a monohybrid cross, 2 heterozygous individuals were crossed, phenotypic ratio came to be (2:1), it is due to__________________?
Correct answer: B. Dominant lethal genes in homozygous individuals
- A. Dominant lethal genes in heterozygous individuals
- B. Dominant lethal genes in homozygous individuals
- C. Dominant epistasis
- D. None of the above
Explanation
A 2:1 surviving phenotypic ratio results when the homozygous dominant genotype is lethal: the usual 3:1 ratio loses one lethal class. The heterozygotes survive, so option b is correct.
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