A ratio of 3:1 in the phenotype of an organism occurs when
A. the alleles are incompletely dominant.
B. only recessive traits are involved.
C. only dominant traits are involved.
D. alleles segregate during meiosis.
E. crossing over has occurred in Anaphase II.
Answer (2)
The correct answer is D
A phenotype ratio of 3:1 indicates there is one dominant and one recessive allele involved, common in a monohybrid cross. This occurs when alleles segregate during meiosis, following Mendelian inheritance principles. Therefore, the correct answer is D.
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