In humans, straight thumbs (S) are dominant to hitchhiker's thumbs (s). If a person with straight thumbs marries someone with hitchhiker's thumbs and they have a child with straight thumbs, what can be concluded about the genotypes of the parents?*1 pointBoth parents must be homozygous dominant.Both parents must be heterozygousThe parent with hitchhiker's thumbs must be homozygous recessive.The parent with straight thumbs must be homozygous dominant.
Question
In humans, straight thumbs (S) are dominant to hitchhiker's thumbs (s). If a person with straight thumbs marries someone with hitchhiker's thumbs and they have a child with straight thumbs, what can be concluded about the genotypes of the parents?*1 pointBoth parents must be homozygous dominant.Both parents must be heterozygousThe parent with hitchhiker's thumbs must be homozygous recessive.The parent with straight thumbs must be homozygous dominant.
Solution
The parent with hitchhiker's thumbs must be homozygous recessive. This is because hitchhiker's thumbs (s) is a recessive trait, and in order for an individual to express a recessive trait, they must have two copies of the recessive allele (ss).
The parent with straight thumbs could either be homozygous dominant (SS) or heterozygous (Ss). However, since they have a child with straight thumbs, we know they must have at least one dominant allele (S). But we can't be sure if they are homozygous dominant or heterozygous just based on this information.
So, the correct answer is: The parent with hitchhiker's thumbs must be homozygous recessive.
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