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TOPIC: Genetics AIM: How are human traits inherited? TOPIC: Genetics AIM: How do multiple alleles affect traits? DO NOW: How many alleles are required for each trait? Where do they come from? 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 Multiple • More than 2 Alleles alleles for a trait • Skin color, blood type, height… Blood • A, B, AB, O Types • A & B genes = dominant • O = recessive • Blood Type A genes = • Pure = AA • Hybrid = AO • Blood Type B genes = • Pure = BB • Hybrid = BO • Blood Type AB genes = • AB •Blood Type O genes = •OO • 1. • AB A x B A AA AB A AA AB AA 50% blood type A 50% blood type AB • 2. • Cross a person with blood type AB with someone who has blood type O. • AB x OO • AB x OO A B O AO BO O AO BO 50% blood type A 50% blood type B • 3. • Cross a person who is hybrid for blood type A with someone who is hybrid for blood type B • AO x BO • AO x BO A O 25% blood type AB B AB BO 25% blood type B O AO OO 25% blood type A 25% blood type O • 4. • What are the possible blood types of a child who's parents are both heterozygous for B blood type? • BO x BO • BO x BO B O B BB BO O BO OO 75% blood type B 25% blood type O • 5. • Cross a female with pure blood type A and a male with heterozygous B blood type. • AA x BO • AA x BO B O A AB AO A AB AO 50% blood type AB 50% blood type A • 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 AB BO B AB AB B AB AB O AO OO B AB AB O AO AO