Question

Two achondroplasic dwarfs have a family of five children; three grow to be normal size and two are dwarfs. What are the genotypes of the parents?

a. Both parents are heterozygous.
b. Both parents are homozygous dominant.
c. Both parents are homozygous recessive.
d. The genotype cannot be determined without more information.

Answer 1

The genotype of the parents cannot be determined without more information.

Step-by-step explanation:

To determine the genotypes of the parents, we need to analyze the phenotypes of their children. In this case, two out of five children are dwarfs, which means they have the genotype tt. Since dwarfism is a recessive trait, this indicates that both parents must carry at least one copy of the recessive allele.

Based on this information, the possible genotypes of the parents are:

a. Both parents are heterozygous (Tt)

b. Both parents are homozygous recessive (tt)

c. The genotype cannot be determined without more information

Since we don't have any additional information, the correct answer is d. The genotype cannot be determined without more information.