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Answer to Question #73500 in Genetics for Thea

Question #73500
If the parents are RrFf x RrFf

what is the fraction of the offspring will be tongue rollers and have free earlobes?
What is the fraction of the offspring will be non-rollers and have free earlobes?
What is the fraction of the offspring will be tongue rollers and have attached earlobes?
Expert's answer
As both parents are heterozygous, it is a typical dihybrid cross, which results in the following phenotypic ratio:
9 tongue rollers with free earlobes : 3 non-rollers with free earlobes : 3 tongue rollers with attached earlobes : 1 non-roller with attached earlobes.

Therefore,
what is the fraction of the offspring will be tongue rollers and have free earlobes? Answer 9/16 = 0.5625
What is the fraction of the offspring will be non-rollers and have free earlobes? Answer 3/16 = 0.1875
What is the fraction of the offspring will be tongue rollers and have attached earlobes? Answer 3/16 = 0.1875

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