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How can you tell if a gene is sex-linked or nonsex-linked if the alleles are not given? Thanks

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It would be pretty difficult to identify a sex-linked gene by just studying a single individual - you would have to collect a sample of the DNA and have it sequenced and gene mapped, which is a complex and expensive process.

The more common way to determine if a gene is sex-linked is to do a family study, collecting information about as many related individuals as possible. Then you would enter this information on a pedigree chart, and analyse the pedigree to look for patterns that indicate sex linkage; specifically, you would be looking to see if the allele in question appears with different frequencies in males and in females.

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