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Sex-Linked Genes: Hairy Ear Syndrome Sex-linked genes are located on the same chromosomes that determine gender (X Y). Depending on whether this is the X or the Y chromosome, these genes are passed down in a predictable pattern to offspring through multiple generations. Color blindness is one such example we have discussed; it’s gene is located on the X chromosome. Another is “Hairy Ear Syndrome” which is caused by a gene located on the Y chromosome. BioEd Online www.BioEdOnline.org Hairy Ears: An Example Only males are affected. All sons of an affected father have hairy ears. Thus, hairy ears is Y-linked. BioEd Online www.BioEdOnline.org Hairy Ears: Female Sex Determination All females are XX. BioEd Online www.BioEdOnline.org Hairy Ears: Male Sex Determination All males are XY. BioEd Online www.BioEdOnline.org Hairy Ears: Gene on the Y Chromosome Code “H” indicates the allele on the Y chromosome for hairy ears. BioEd Online www.BioEdOnline.org Hairy Ears: Wild-Type Allele for Normal Ears Code “+” indicates the allele on the Y chromosome for normal ears. BioEd Online www.BioEdOnline.org Sex-Linked Genes: Hairy Ear Syndrome BioEd Online www.BioEdOnline.org
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