# 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?

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

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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