3 1 Sex Linked

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3 1 Sex Linked

  1. 1. Launch <ul><li>What does it mean to be homozygous recessive? *Use scientific language and terms* </li></ul><ul><li>Complete the punnett using ratios for genotype and phenotypes: </li></ul><ul><li>Why in a normal human being do you only get one allele from each parent? </li></ul>X Y X X
  2. 2. Cross a homozygous dominant with a recessive (for height where T is dominant and tall). Find the genotype and the phenotype
  3. 3. Cross a heterozygote with a recessive (for height where T is dominant and tall). Find the genotype and the phenotype
  4. 4. Cross a heterozygote with another heterozygote (for skin color where Black is B, b = white). Find the genotype and the phenotype
  5. 5. Cross a heterozygote with another heterozygote (for nose size where big nose is N and small nose is n). Find the genotype and the phenotype
  6. 6. a trait that is found on either the X or Y chromosome Examples include baldness and color blindness Sex Linked Trait
  7. 7. Sex linked traits are more likely to affect males Sex Linked Trait
  8. 8. Hemophilia is a disease where your blood doesn’t clot . Hemophilia is an example of a sex linked trait. Hemophilia
  9. 9. Hemophilia only occurs when all of the X chromosomes have a copy of the recessive gene.
  10. 10. X H X h : female carrier X h X h : female hemophiliac X H Y: normal male X h Y: hemophiliac male
  11. 13. chart that shows the relationships within a family PEDIGREE
  12. 14. Pedigree Basics <ul><li>Males are squares , females are circles </li></ul><ul><li>Shaded figures represent individuals with the trait </li></ul><ul><li>Generations are numbered with roman numerals (I, II, II, IV) from top to bottom </li></ul>
  13. 18. Klinefelter Syndrome <ul><li>Males with Klinefelter syndrome have two X chromosomes, and one Y </li></ul>X Y XX 0 XXX XXY X,0 Y,0
  14. 20. Klinefelter Syndrome <ul><li>Have male genitalia and internal ducts, but underdeveloped testes </li></ul><ul><li>Do not produce sperm </li></ul><ul><li>Slight enlargement of the breasts </li></ul><ul><li>47,XXY </li></ul><ul><li>1 out of every 500 male births </li></ul>
  15. 21. Turner Syndrome <ul><li>People with Turner Syndrome only receive one sex chromosome, an X. </li></ul>X Y XX 0 XXX XXY X,0 Y,0
  16. 23. Turner Syndrome <ul><li>Has female external genitalia </li></ul><ul><li>Underdeveloped ovaries </li></ul><ul><li>Short (under 5 feet) </li></ul><ul><li>Webbed Neck </li></ul><ul><li>Broad, Shield-like chest </li></ul><ul><li>45,X </li></ul><ul><li>1 out of every 3000 female births </li></ul>

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