Question

free earlobes hang below the point where the ear lobe attaches to the head. attached earlobes do not hang, but are attached to the head. the gene for free earlobes is dominant (f), while the gene for attached earlobes is recessive (f). both of ashleys parents have free earlobes but also carry a recessive gene for attached earlobes. ashley has attached earlobes, so she must have
a one dominant gene for free earlobes.
b two dominant genes for free earlobes.
c one recessive gene for attached earlobes.
d two recessive genes for attached earlobes.

Explanation:

Attached earlobes are a recessive trait, meaning they only appear when an individual has two copies of the recessive gene (f). Dominant genes (F) mask recessive traits, so any presence of F would result in free earlobes. Since Ashley has attached earlobes, she must have two recessive alleles.

Answer:

D. two recessive genes for attached earlobes.