Sex-Limited Traits<br />Autosomal, not found in the sex chromosomes<br />Genes are carried by both males and females, but only one sex would ever express them<br />Example: genes that influence how much milk a lactating mother produces when she’s nursing a baby<br />Another example: cryptorchidism (undescended testicles)<br />
Sex-Influenced Traits<br />Autosomal, not found in the sex chromosomes<br />Genes are carried by both males and females, but there is a difference in the way the two sexes express them<br />Example: pattern baldness in humans. The baldness allele behaves like a dominant allele in males, while in females it behaves like a recessive allele<br />
Sex-Linked Traits<br />Genes are found on the sex chromosomes<br />Sex-linked traits are behave differently from autosomal traits when sex chromosomes are non-homologous<br />May be dominant or recessive in nature<br />Phenotype is dependent also on the presence of a complete gene pair or just one allele<br />Example: Hemophilia (X-linked)<br />
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