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4/11/ 12 Bell Ringer

4/11/ 12 Bell Ringer. What does incomplete dominance mean? If I had a Red Homozygous Flower and a White Homozygous Flower, what would the H eterozygous Flower look like in incomplete dominance ?

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4/11/ 12 Bell Ringer

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  1. 4/11/ 12Bell Ringer What does incomplete dominance mean? If I had a Red Homozygous Flower and a White Homozygous Flower, what would the Heterozygous Flower look like in incomplete dominance? If I had a Dark Brown Homozygous Horse and a White Homozygous Horse, what would the Heterozygous Horse look like in incomplete dominance?

  2. Incomplete Dominance • When one allele is not completely dominant over another. • Heterozygous phenotype is between the two homozygous phenotypes. Homozygous Heterozygous Homozygous

  3. x RR R’R’ R R RR’ RR’ R’ RR’ RR’ R’

  4. Now you try one A Heterozygous snapdragon flower is crossed with another Heterozygous snapdragon flower. What Genotypes and Phenotypes could the offspring potentially have? x RR’ RR’

  5. R R’ R R R R’ R R R’ R’ R’ R’ 25% RR 50% RR’ 25% R’ R’ 25% Red 50% Pink 25% White

  6. Codominance • When two dominant alleles are expressed at the same time. • The phenotypes of both homozygotes are produced in heterozygotes.

  7. x BB WW B B BW BW W BW BW W

  8. Now you try one A Heterozygous Chicken is crossed with a Homozygous White Chicken. What Genotypes and Phenotypes could the offspring potentially have? BW WW

  9. W W BW BW 50% BW 50% WW B 50% Checkered 50% White WW WW W

  10. Multiple Alleles • Some traits can have multiple alleles that control what phenotype an organism will have. B = Dominant to b but recessive to B A B = Dominant b = Recessive to both of the other alleles A

  11. Multiple Alleles In Humans BLOOD TYPING: Single gene that has multiple alleles O A B AB

  12. How is a person’s blood type determined? • By the presence or absence of large molecules (Antigens) on the red blood cells. • Antibodies (part of our immune system) react with foreign antigens so it is important for doctors to know their patients blood type.

  13. ABO Blood Group There are 3 alleles for blood type A, B, and O

  14. A is dominant to OB is dominant to OA and B are Codominant There are 3 alleles for blood type: A, B, and O

  15. How many different allele combinations are there for Blood Type?

  16. A person with the blood type AA is crossed with a person with the blood type BB. What blood types could their offspring have?

  17. A A B AB AB B AB AB

  18. One parent has the blood type A and the other blood type B. What are the genotypes of the parents if they produce children with only blood type AB? Parents Phenotype Parents Genotype or Type A Type B or A A A O B B B O

  19. A O A O A A A A B B B B AB AB AB AB BO AB AB BO B O B O AB AB AO AO AB AO BO OO

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