Attached earlobes are a recessive trait in humans. in the tree below, people with attached earlobes are shaded in. which best describes the person labeled x in the tree?

c. a male with one recessive allele.
d. a male with no recessive alleles.

The answer is a C. The offsprings from this generation are from a cross between parents who are heterozygous (one parent) and homozygous recessive. This means that all the offsprings of the filial 1 (one) generation will carry a recessive allele. However, those with an equivalent dominant allele will not exhibit the attached earlobe trait. This is shown by the Punnet square below;

trachea, alveoli, lung capillaries, arteries