Question

Attached earlobes are a reccesive trait in humans. in the tree below, people with attached earlobes are shaded in. which best describes labeled x in the tree?
A: a female with one recessive allele

B: a female with no recessive alleles

C: a male with no recessive alleles

D: a male with one recessive allele ​

Answer 1

That would be D. A male with one recessive allele.

Squares represent males and circles represent females. This male has gotten 1 recessive allele from her mom(her genotype is aa because she is expressing the recessive trait).