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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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  • 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



Multiple alleles rabbit coat
Multiple Alleles: Rabbit Coat

  • C = agouti (dark gray)


Example rabbits
Example: Rabbits

  • C = dark gray

  • cch = chinchilla (light gray)


Example rabbits1
Example: Rabbits

  • C = dark gray

  • cch = chinchilla (light gray)

  • ch = himalayan (white with black points)


Example rabbits2
Example: Rabbits

  • C = dark gray

  • cch = chinchilla (light gray)

  • ch = himalayan (white with black points)

  • c = white


Example rabbits3
Example: Rabbits

  • C = dark gray

  • cch = chinchilla (light gray)

  • ch = himalayan (white with black points)

  • c = white

  • Dominance: C> cch > ch > c


Genotypes
Genotypes

  • White: cc (homozygous recessive)


Genotypes1
Genotypes

  • White: cc

  • Himalayan: chch or chc


Genotypes2
Genotypes

  • White: cc

  • Himalayan: chch or chc

  • Chinchilla: cchcchor cchch or cchc


Genotypes3
Genotypes

  • White: cc

  • Himalayan: chch or chc

  • Chinchilla: cchcchor cchchor cchc

  • Gray: CC or C cchor C chor Cc


Practice problem
Practice problem

  • Draw the Punnett square and give the phenotype ratios for the following cross:

    C cchxchch


Try another
Try Another:

  • Draw a Punnett Square and give the phenotype ratios for the offspring of these parents:

  • Cc xCCh


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