Sex linked traits

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Sex linked traits

  1. 1. Sex-Linked Traits X chromosome Y chromosome Boy or Girl? The Y Chromosome “Decides”
  2. 3. What are Sex Linked Traits ? <ul><li>In 1910, Thomas Morgan discovered traits linked to sex chromosomes in fruit flies. </li></ul><ul><li>Some genes are attached to the X and Y chromosomes </li></ul><ul><li>EXAMPLE: In humans, colorblindness and baldness are found on the X chromosomes </li></ul>
  3. 4. What are Sex Linked Traits ? <ul><li>In Men, traits expressed anytime present </li></ul><ul><li>In Women, must have two genes to show trait </li></ul><ul><li>Children inherit baldness from their mothers </li></ul>
  4. 5. Punnett Square: What sex will the offspring be? 50% chance of a male or a female child.
  5. 6. Baldness is carried by the mother Phenotype: 25% bald males 25% bald carrier females 25% not bald males 25% non-carrier females
  6. 7. If Dad is bald, will you be bald? Phenotype: 0% bald males 100% bald carrier females
  7. 8. What if Mom is bald? Phenotype: 100% carrier females 100% bald males

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