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Hemophilia is an X-linked recessive disorder (Xh) that is passed through generations and can be traced by using a pedigree.
John is an empty square with a x Upper H Y genotype.
Based on the pedigree that is shown, which describes John?
carrier for hemophilia
expresses hemophilia
does not have hemophilia
expresses hemophilia and died of complications
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Answered by
GPT-5 mini
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Does not have hemophilia.
Reason: John is male with genotype X^H Y (normal allele on his X). For X-linked recessive traits, males with a normal X (X^H Y) are unaffected; only X^h Y males would express hemophilia. Males cannot be "carriers."
Reason: John is male with genotype X^H Y (normal allele on his X). For X-linked recessive traits, males with a normal X (X^H Y) are unaffected; only X^h Y males would express hemophilia. Males cannot be "carriers."
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