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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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Notes: Multiple Alleles

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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


  • 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


Multiple Alleles: Rabbit Coat

  • C = agouti (dark gray)


Example: Rabbits

  • C = dark gray

  • cch = chinchilla (light gray)


Example: Rabbits

  • C = dark gray

  • cch = chinchilla (light gray)

  • ch = himalayan (white with black points)


Example: Rabbits

  • C = dark gray

  • cch = chinchilla (light gray)

  • ch = himalayan (white with black points)

  • c = white


Example: Rabbits

  • C = dark gray

  • cch = chinchilla (light gray)

  • ch = himalayan (white with black points)

  • c = white

  • Dominance: C> cch > ch > c


Genotypes

  • White: cc (homozygous recessive)


Genotypes

  • White: cc

  • Himalayan: chch or chc


Genotypes

  • White: cc

  • Himalayan: chch or chc

  • Chinchilla: cchcchor cchch or cchc


Genotypes

  • White: cc

  • Himalayan: chch or chc

  • Chinchilla: cchcchor cchchor cchc

  • Gray: CC or C cchor C chor Cc


Practice problem

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

    C cchxchch


Try Another:

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

  • Cc xCCh


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