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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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Presentation Transcript
slide3
Single Allele = R or r
  • Possible genotypes: RR, Rr, rr
slide4
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)
slide6
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
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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