QQuestionAnatomy and Physiology
QuestionAnatomy and Physiology
The 9:3:3:1 ratio is obtained:
A. All of the above
B. In a dihybrid cross in which the genes are linked on the same chromosome
C. In a dihybrid cross in which the genes are on different chromosomes
D. When crossing over occurs
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Step 2: Understanding Dihybrid Cross Ratios
In a typical dihybrid cross with genes on different chromosomes (independent assortment), the expected phenotypic ratio is 9:3:3:1. This ratio occurs when two different genes are inherited independently.
Final Answer
In a dihybrid cross in which the genes are on different chromosomes Key Insight: The 9:3:3:1 ratio is a classic result of independent assortment, which occurs when genes are located on different chromosomes and segregate independently during meiosis.
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