Imagine a dihybrid cross. if there are 100 progeny (we are talking about flies here), approximately how many flies would you expect to be homozygous recessive for both traits?

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Biology

Leonel Wyatt

11 October, 05:44

Imagine a dihybrid cross. if there are 100 progeny (we are talking about flies here), approximately how many flies would you expect to be homozygous recessive for both traits?

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Faith Case · Answer 1

In a dihybrid cross, the ratio of the offspring is

9-homozygous dominant for both traits

3-dominant for one trait and recessive for the other)

3 - dominant for one trait and recessive for the other

1 - homozygous recessive for both traits

Therefore there will be one-sixteenth of homozygous recessive for both traits (9+3+3+1=16) of a 100 flies in the next generation, or more precisely 6,25.