In humans, the gene for dimpled cheeks (D) is dominant over its allele for smooth cheeks (d). Complete the Punnett square given the parental cross (DD x dd) and then answer the accompanying questions.

What is the phenotypic ratio for this cross?

a. 25% dimpled: 75% smooth
b. 50%dimpled: 50% smooth
c. 75% dimpled: 25% smooth
d. 100% smooth cheeks
e. 100% dimpled cheeks

Question

13-08-2024
Biology

Answered

In humans, the gene for dimpled cheeks (D) is dominant over its allele for smooth cheeks (d). Complete the Punnett square given the parental cross (DD x dd) and then answer the accompanying questions.

What is the phenotypic ratio for this cross?

a. 25% dimpled: 75% smooth
b. 50%dimpled: 50% smooth
c. 75% dimpled: 25% smooth
d. 100% smooth cheeks
e. 100% dimpled cheeks

Answer :

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darrenl37843 darrenl37843 · Answer 1 · 2024-08-13T12:53:44-04:00

Answer: e. 100% dimpled cheeks

Explanation: The allele for dimpled cheeks (D) is dominant, meaning that it only needs one copy for the phenotype to be expressed. On the other hand, the allele for smooth cheeks (d) is recessive, meaning that humans need two copies of the allele in order for the trait to be expressed. Therefore, an individual with genotype "Dd" will have dimpled cheeks since they have a dominant allele for dimpled cheeks.

By using a Punnett Square, we can determine that all of the offspring will have the genotype "Dd." Thus, 100% of their offspring would end up having dimpled cheeks, making choice e the correct answer.