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Humans have 23 pairs of chromosomes.

Sex Linked Traits. Humans have 23 pairs of chromosomes. One pair of chromosomes is related to the sex of an individual , these chromosomes are called sex chromosomes. Sex Linked Traits. The other 22 pairs of chromosomes are called autosomes (1-22). Sex Linked Traits.

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Humans have 23 pairs of chromosomes.

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  1. Sex Linked Traits • Humans have 23 pairs of chromosomes. • One pair of chromosomes is related to the sex of an individual , these chromosomes are called sex chromosomes

  2. Sex Linked Traits • The other 22 pairs of chromosomes are called autosomes (1-22)

  3. Sex Linked Traits • In humans, the sex of an individual depends on the presence or absence of the Y chromosome A normal human female is XX A normal human male is XY

  4. Sex Linked Traits • Genes that are located on the X chromosome are called sex-linked genes. • Traits determined by sex-linked genes are called sex-linked traits  (c = colorblind, C = normal) Ex. Color blindness female Xc Xc male Xc Y

  5. Sex Linked Traits • Sex linked traits are recessive, this means both x chromosomes must have the gene in order for the trait to be expressed.

  6. Sex Linked Traits • If only one x chromosome is present (in males)and has the sex linked gene, then the trait will be expressed

  7. Carriers • A carrier is a person that has the trait on only one chromosome and does not express the trait. Carriers of sex linked traits are always women. (C= normal, c= colorblind) Ex. Color blind carrier XC Xc

  8. Sex Linked Punnett Squares • A colorblind male marries a normal female. What are the offspring genotypes and phenotypes? (C = normal, c = colorblind) Xc Y XC XC

  9. Sex Linked Punnett Squares • A colorblind male marries a normal female. What are the offspring genotypes and phenotypes? (C = normal, c = colorblind) Xc Y XCXCXc XC Y XC XCXc XC Y

  10. Sex Linked Punnett Squares • A normal male (not colorblind) marries a carrier. What are the offspring genotypes and phenotypes? XC Y XC Xc

  11. Sex Linked Punnett Squares • A normal male (not colorblind) marries a carrier. What are the offspring genotypes and phenotypes? XC Y XC XC XC XC Y Xc Xc Xc Xc Y

  12. Sex Linked Punnett Squares • A normal male (not colorblind) marries a colorblind female. What are the offspring genotypes and phenotypes? XC Y Xc Xc

  13. Sex Linked Punnett Squares • A normal male (not colorblind) marries a colorblind female. What are the offspring genotypes and phenotypes? XC Y Xc XC Xc Xc Y Xc XC Xc Xc Y

  14. Hemophilia • Hemophilia is characterized by uncontrolled bleeding • It is a sex linked disorder caused by errors in the DNA that codes for the proteins involved in clotting

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