When two genes control a single character and have a cumulative effect, the ratio is

1:1:1:1

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1:4:6:4:1

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1:2:1

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1:6:15:20:15:6:1

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Solution

The correct option is B 1:4:6:4:1
A. 1: 1: 1: 1 is the phenotypic ratio of a dihybrid test cross.
B. 1: 4: 6: 4: 1 is the ratio in case of polygenic inheritance when two genes control a single character.
C. 1: 2: 1 is the phenotypic ratio of a monohybrid cross when a homozygous dominant individual is crossed with a homozygous recessive individual.
D. 1: 6: 15: 20: 15: 6: 1 is the ratio of in case of polygenic inheritance when four genes control a single character.
So, the correct answer is '1: 4: 6: 4: 1'.

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