Biology

Question

1.1.2 Quiz: Organization of DNA

Question 1 of 10

A family has two male children. One brother has a straight thumb, while the

other brother has a bent thumb. What causes this difference?

• A. They received different alleles from their parents.

B. The brothers have different numbers of alleles.

• c. The brothers have different numbers of chromosomes.

D. One brother has more X chromosomes than the other.

Answer

A. They received different alleles from their parents.

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The difference in thumb shape is caused by the different alleles that the brothers received from their parents. Alleles are variations of a gene that can...