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).

Answer 2

A male with one recessive allele​ best describes labeled x in the tree (Option D).

What is a recessive allele?

A recessive allele is a gene variant completely masked by a dominant gene variant in heterozygous individuals.

• Moreover, a pedigree is a diagram that shows the alleles and genotypes in a genealogical tree.

• In a pedigree, squares generally represent males, whereas the condition is represented by dashed squares/circles.

In conclusion, a male with one recessive allele​ best describes labeled x in the tree (Option D).

Learn more about recessive alleles here:

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