Tuesday, March 28

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Tuesday, March 28

• Do now- have out blood type homework
• 1. Review homework
• 2. Notes 10.5
• 3. Study guide
• HW- study guides due tomorrow

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Chapter 10

• Section 5- sex-linked traits

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Sex-linked genes

• Sex-linked genes are genes that are located on a
  sex chromosome
• Most sex-linked genes are found on the X sex
  chromosome
• Morgan found these genes during his experiments
  on fruit flies

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Sex-linked Traits

• Females have XX
• Males have XY
• Females must inherit the trait from both her
  parents to express the trait
• Males inherit the trait from their mother because
  they get the Y chromosome from dad

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Sex-linked disorders

• In humans a number of disorders are inherited
  through sex-linkage
• Red-green colorblindness
• Hemophilia
• Baldness
• Males only need one trait to express the
  disorder, females need two

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