Question

this passage describes the xeroderma pigmentosum trait in humans:
xeroderma pigmentosum is a condition that causes skin to be easily damaged by sunlight. humans with xeroderma pigmentosum avoid exposure to sunlight by wearing protective clothing, using sunscreen, and not going outside during the day.
in a group of humans, some individuals have xeroderma pigmentosum and others do not. in this group, the gene for the xeroderma pigmentosum trait has two alleles. the allele for not having xeroderma pigmentosum (e) is dominant over the allele for having xeroderma pigmentosum (e).
hakim, a human from this group, has xeroderma pigmentosum.
based on hakims phenotype for the xeroderma pigmentosum trait, which of the following could be hakims genotype for the xeroderma pigmentosum gene? select all that apply.
ee ee ee

Explanation:

Step1: Recall Dominant/Recessive Rules

Dominant allele (E) masks recessive (e). Phenotype with recessive trait (xeroderma pigmentosum) requires recessive genotype (ee), since E (non - trait) is dominant.

Step2: Analyze Each Genotype

• EE: Has two dominant alleles. Phenotype would be no xeroderma pigmentosum (since E is dominant for non - trait), so not possible for Hakim (who has the trait).
• Ee: Has one dominant (E) and one recessive (e) allele. The dominant allele (E) masks the recessive (e), so phenotype is no xeroderma pigmentosum, not possible for Hakim.
• ee: Has two recessive alleles. Since the recessive allele (e) is for xeroderma pigmentosum and there's no dominant (E) to mask it, the phenotype is xeroderma pigmentosum, which matches Hakim's trait.

Answer:

ee