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A boy is born with an autosomal recessive genetic disease that is determined by a single-gene...

A boy is born with an autosomal recessive genetic disease that is determined by a single-gene defect. Both his parents are unaffected. What is the most accurate statement can we say about the parents genotypes with respect to the relevant locus?

In the following statement there are 2 fill in spots, i am providing the options given at these spots and putting them in bold, and in parentheses.

(ONE/BOTH) of his parents must be ["homozygous", "heterozygous"] for the disease-causing allele

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Answer:- Both, heterozygous

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