Alleles Multiple€¦ · A male black rabbit, heterozygous for albino, mates with a female black...
Transcript of Alleles Multiple€¦ · A male black rabbit, heterozygous for albino, mates with a female black...
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Multiple Alleles
SBI3U Biology
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Multiple = Many
Some genes have more than just 2
alleles
They may have 2 or more dominants or
recessives
At the same time, these alleles could be
codominant or incomplete dominant.
This is complex, but it is one big way
genetic diversity happens.
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Multiple Genotypes
When writing genotypes, use
superscripts
There may be more than one
superscript
Treat the allele letter and the
superscript as one symbol
CR>Cw>Cr
*CRCr CRCR
CrCrCwCw
Buttercup Rose
Walnut Pea
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Example: Rabbit fur colour
Multiple recessive alleles
C = dominant, black
cch = recessive, chinchilla
ch = recessive, himalayan
c = recessive, white albino
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Example: Rabbit fur colour
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Example: Pigeon Feather ColourMultiple recessive alleles
B = dominant, blue-grey b = recessive, brown br = recessive, Ash-Red
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Example: Human Blood TypesMultiple dominant alleles
I stands for immunoglobin,
a blood cell protein
IA = dominant, Protein A
IB = dominant, Protein B
i = recessive, no protein 0
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Example: Human Blood Types
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Example: Human Blood Types
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Example: Human Hair ColourMultiple alleles in multiple genes! Very complex!
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Try these:1. A man with type A blood, but with a type O mother, has a child with a
Type AB woman. What are their genotypes, and what can they expect to
see in their children?
2. A male black rabbit, heterozygous for albino, mates with a female black
rabbit heterozygous for chinchilla. What are their genotypes and what
might we see in their litter of bunnies?
3. A male pigeon, homozygous for ash red, mates with a female,
heterozygous for brown. What are their genotypes and what might we
see among their squab?
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Solution 1:1. A man with type A blood, but with a type O mother, has a child with a Type AB
woman. What are their genotypes, and what can they expect to see in their children?
IA i
IA
IB
IA IA IA
IAIB IBi
i
Genotypes:
Father IAi Mother IAIB
Genotypic ratio 1:1:1:1
Phenotypic ratio 1:2:1
One AB, two A, one B
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Solution 2:2. A male black rabbit, heterozygous for albino, mates with a female black rabbit heterozygous
for chinchilla. What are their genotypes and what might we see in their litter of bunnies?
cchC
C
c
C C C
Cc
Genotypes:
Male Cc Female Ccch
Genotypic ratio 1:1:1:1
Phenotypic ratio 3:1
Three black, one chinchilla
cch
cchc
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Solution 3:3. A male pigeon, homozygous for ash red, mates with a female, heterozygous for
brown. What are their genotypes and what might we see among their squab?
brbr
br
br
brbr br br
Genotypes:
Male brbr Female bbr
Genotypic ratio 1:1
Phenotypic ratio 1:1
1 brown for every 1 ash red
b b br b