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SEX RELATED INHERITANCE

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SEX RELATED INHERITANCE

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    1. SEX RELATED INHERITANCE

    2. HOW IS SEX (gendeR) DETERMINED?

    3. How is Sex Determined?

    4. XY System

    5. ZW System

    6. X0 System

    7. SEX LIMITED Traits

    8. Sex-Limited Traits Autosomal, not found in the sex chromosomes Genes are carried by both males and females, but only one sex would ever express them Example: genes that influence how much milk a lactating mother produces when she’s nursing a baby Another example: cryptorchidism (undescended testicles)

    9. SEX INFLUENCED Traits

    10. Sex-Influenced Traits Autosomal, not found in the sex chromosomes Genes are carried by both males and females, but there is a difference in the way the two sexes express them Example: pattern baldness in humans. The baldness allele behaves like a dominant allele in males, while in females it behaves like a recessive allele

    11. SEX LINKED Traits

    12. Sex-Linked Traits Genes are found on the sex chromosomes Sex-linked traits are behave differently from autosomal traits when sex chromosomes are non-homologous May be dominant or recessive in nature Phenotype is dependent also on the presence of a complete gene pair or just one allele Example: Hemophilia (X-linked)

    13. Reference Kent Kawashima Biology 11 Addison Wesley

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