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Notes: Multiple Alleles

Notes: Multiple Alleles. Single Allele = R or r Possible genotypes: RR, Rr , rr. Multiple Alleles: A, B, O Possible Genotypes: AA, BB, OO, AO, BO, AB Notice how each organism still only has two alleles (one from Mom, Dad). Multiple alleles = Traits controlled by more than two alleles.

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Notes: Multiple Alleles

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  1. Notes: Multiple Alleles

  2. Single Allele = R or r • Possible genotypes: RR, Rr, rr

  3. Multiple Alleles: A, B, O • Possible Genotypes: AA, BB, OO, AO, BO, AB • Notice how each organism still only has two alleles (one from Mom, Dad)

  4. Multiple alleles = Traits controlled by more than two alleles

  5. Eye color alleles: Brown, Green, Blue • Dominance = Brown > green > blue • Genotype determines amount of melanin in iris • (more melanin = brown) • For more in depth eye genetics: • eye alleles

  6. Multiple Alleles: Rabbit Coat • C = agouti (dark gray)

  7. Example: Rabbits • C = dark gray • cch = chinchilla (light gray)

  8. Example: Rabbits • C = dark gray • cch = chinchilla (light gray) • ch = himalayan (white with black points)

  9. Example: Rabbits • C = dark gray • cch = chinchilla (light gray) • ch = himalayan (white with black points) • c = white

  10. Example: Rabbits • C = dark gray • cch = chinchilla (light gray) • ch = himalayan (white with black points) • c = white • Dominance: C> cch > ch > c

  11. Genotypes • White: cc (homozygous recessive)

  12. Genotypes • White: cc • Himalayan: chch or chc

  13. Genotypes • White: cc • Himalayan: chch or chc • Chinchilla: cchcchor cchch or cchc

  14. Genotypes • White: cc • Himalayan: chch or chc • Chinchilla: cchcchor cchchor cchc • Gray: CC or C cchor C chor Cc

  15. Practice problem • Draw the Punnett square and give the phenotype ratios for the following cross: C cchxchch

  16. Try Another: • Draw a Punnett Square and give the phenotype ratios for the offspring of these parents: • Cc xCCh

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