Facial dimples and free earlobes are…

Biology Questions

Facial dimples and free earlobes are both considered dominant human traits. What are the expected phenotypes of the offspring from a female with dimples and free earlobes (DDFf) and a male with no dimples and attached earlobes (ddff)? A) 75% with dimples and free earlobes and 25% with no dimples and attached earlobes B) 50% with dimples and free earlobes and 50% with no dimples and attached earlobes C) 50% with dimples and free earlobes and 50% with dimples and attached earlobes D) 75% with dimples and attached earlobes and 25% with no dimples and free earlobes

Answer

c 50% with dimples and free earlobes and 50% with dimples and attached earlobes Explanation: As outlined in the question, both facial dimples and free earlobes are dominant traits in humans. We need to determine the phenotypes of the offspring from a female with dimples and free earlobes (DDFf) mated with a male that has no dimples and attached earlobes (ddff). Let’s analyze the genetic cross: P1: DDFf X ddff Gametes: DF: Df : df: df Offspring: 50%: DDFf with dimples and free earlobes 50%: Ddff with dimples and attached earlobes. For further clarity, I’ve created a punnett square to illustrate the results of the cross. I hope this helps!

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