alleles
TRANSCRIPT
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Certain types of rabbits…
…can either be brown, white, have a chinchilla pattern, or have a himalayan pattern
C causes fully brown coatcc causes albino (white)cch causes a chinchilla patternch causes a Himalayan patternThe alleles are arranged in the following
pattern C > cch > ch > c
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Full color rabbit – alleles are dominant to all others; CC, Ccch, Cch, or Cc
Chinchilla rabbit – partial defect in pigmentation
cch allele dominant to all other alleles except C; cchch, cchcch, or cchc
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• Himalayan rabbit – color in certain parts of the body; dominant only to c; chc or chch
• Albino rabbit – no color – allele is recessive to all other alleles; cc
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C > cch > ch > cPredict the outcome of the following cross:
A full brown rabbit (Cch) and chinchilla (cchc) patterned rabbit mate…what phenotypes would you predict in the offspring? (…and in what percentages?)
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• How does this type of inheritance differ from what we’ve done in the past?
Answer There are more than two alleles for hair color in rabbits. 1 trait = more than 2 alleles… This type of inheritance is called…
…Multiple Allele Inheritance (when 3 or more alleles exist for a given trait)
A rabbit’s coat color is determined by a single gene that has at least 4 different alleles.
What other traits are controlled by multiple alleles?
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4 possible phenotypes: A, B, AB or O
6 possible genotypes: A – type A (IAIA)
type A (IAi)
B – type B (IBIB)
type B (IBi)
AB – type AB (IAIB)
O – type O (ii)
Every person carries two alleles for blood type (out of a total of three allele options – (IA), (IB), (i)
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Practice Problems
IAi x IAi (A x A)IBi x ii (B x O)IAIA x IBi (A x B)A couple, both of whom have type
AB blood, can have children with how many different blood types? What are they?