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Genetics: Understanding Multiple Alleles in Inheriting Human Traits

Explore how multiple alleles influence traits inheritance using Punnett Squares for dihybrid crosses in genetics. Learn how blood types A, B, AB, and O are determined through allele combinations. Discover the genotypes and probabilities of offspring with different blood types.

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Genetics: Understanding Multiple Alleles in Inheriting Human Traits

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  1. TOPIC: GeneticsAIM: How are human traits inherited?

  2. TOPIC:Genetics AIM: How do multiple alleles affect traits? DO NOW: How many alleles are required for each trait? Where do they come from?

  3. The Punnett Squares we learned about are monohybrid crosses. They involve only 1 trait. A dihybrid cross involves 2 traits. EXAMPLE: In guinea pigs, B = black fur, b = brown fur S = short fur, s = long fur

  4. Multiple Alleles More than 2 alleles for a trait Skin color, blood type, height…

  5. Blood Types A, B, AB, O A & B genes = dominant O = recessive

  6. Blood Type A genes = Pure = AA Hybrid = AO

  7. Blood Type B genes = Pure = BB Hybrid = BO

  8. Blood Type AB genes = AB

  9. Blood Type O genes = OO

  10. 1. AB x AA A B • 50% blood type A A A A A B • 50% blood type AB A A A A B

  11. 2. Cross a person with blood type AB with someone who has blood type O. AB x OO

  12. AB x OO A B • 50% blood type A O A O B O • 50% blood type B O A O B O

  13. 3. Cross a person who is hybrid for blood type A with someone who is hybrid for blood type B AO x BO

  14. AO x BO A O • 25% blood type AB B A B B O • 25% blood type B O A O O O • 25% blood type A • 25% blood type O

  15. 4. What are the possible blood types of a child who's parents are both heterozygous for B blood type?  BO x BO

  16. BO x BO B O B B B B O • 75% blood type B O • 25% blood type O B O O O

  17. 5. Cross a female with pure blood type A and a male with heterozygous B blood type. AA x BO

  18. AA x BO B O A A B A O • 50% blood type AB A • 50% blood type A A B A O

  19. 6.A male with blood type B has a child with a woman who has blood type A. The child is blood type O. What is the genotype of the male and female? Show your work. BO x AO A O A A A A B A B B O B A B A B B A B A B O O B A O O O A O A O A B A B

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