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Sex-Linked Genes

Sex-Linked Genes. Sample Problem!. Show, using a Punnett Square, that there is a 50% of having a boy or a girl when humans mate (aka get it on). Determination of Sex. Girls: XX (homologous sex chroms) Boys: XY (non-homol. sex chroms) Only ends of Y have regions homologous to X. X. Y.

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Sex-Linked Genes

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  1. Sex-Linked Genes

  2. Sample Problem! • Show, using a Punnett Square, that there is a 50% of having a boy or a girl when humans mate (aka get it on).

  3. Determination of Sex • Girls: XX (homologous sex chroms) • Boys: XY (non-homol. sex chroms) • Only ends of Y have regions homologous to X X Y

  4. Sex Linked Genes • Found on sex chroms, mainly X (contains more DNA). • Easy to spot b/c many males will have trait  XY..if trait is on X, no competition on Y (less DNA)

  5. Hemophilia-A Sex Linked Gene

  6. Colorblindness- A Sex-Linked Gene

  7. Colorblindness- A Sex-Linked Gene

  8. Colorblindness- A Sex-Linked Gene

  9. Colorblindness- A Sex-Linked Gene

  10. Fruit Fly Genetics! • Good for genetic studies (Drosophila melanogaster:  breed at a high rate  A generation can be bred every 2 weeks  Only have 4 pairs of chromosomes

  11. Wild type = normal phenotype • Traits alternative to wild type: mutants

  12. Some Traits are Sex Limited and Expression Depends on Sex of Individual

  13. Let’s do another Sample Problem! H

  14. Sex Linked Fruit Fly Sample Probs, Video Clip, and Lab

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