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Which of the following ratio shows complementary gene interaction?

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Which of the following ratio shows complementary gene interaction?

(a) 9:7

(b) 15:1

(c) 1:2:1

(d) 9:3:3:1

The question was posed to me in class test.

This interesting question is from Gene Interaction topic in division Genetics of Life Sciences

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Correct choice is (a) 9:7

For explanation I would say: Complementary gene interaction is first discovered by William Bateson and Reginald Punette in 1906. 9:7 ratio shows the 9 offspring have both dominant genes, while 7 is having either one dominant or both recessive.

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