incomplete codominance multiple_alleles
TRANSCRIPT
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Incomplete Dominance, Codominance and Multiple
Alleles
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INCOMPLETE DOMINANCEIncomplete Dominance- Pattern of gene
expression in which the phenotype of a heterozygous individual is intermediate between those of the parents.
• Cases in which one allele is not completely dominant over another.
Example: Snapdragonsand Carnations
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Incomplete Dominance- F1 generation
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Incomplete Dominance- F2 generation
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CODOMINANCECodominance- The condition in which both
alleles in a heterozygous organism are expressed.
• BOTH alleles contribute to the phenotype.• The two alleles don’t blend, but are rather
both present in the offspring.Examples- Checkered Chickens, Roan Horses,
Roan Cows, Variegated Clover.
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B B
W
W
BW BW
BW BW
Codominance W
hite
chi
cken
Black chicken
Checkered
Checkered Checkered
Checkered Checkered
Black White
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http://search.vadlo.com/b/q?rel=2&keys=Dominance+Incomplete+Dominance+Codominance+PPT
Roan Horse
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Roan Cattle
Variegated Clover
http://3.bp.blogspot.com/_zUPrgMM5tUg/SSVdrs59_uI/AAAAAAAAAA8/qJGjG2nZPhk/s200/codominance.GIF
http://www.ccs.k12.in.us/chsteachers/BYost/Biology%20Notes/CH11notescoincompletedom_files/image004.jpg
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Multiple Alleles
Multiple Alleles- Genes which have more than two alleles.
It is common for more than 2 alleles to control a trait in a population
Multiple alleles can only be studied in populations since each individual only has 2 alleles for a trait.
Examples: human blood types, fruit fly eye color, coat color in rabbits: C, cch, ch, and c.
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Complex Inheritance and Human Heredity
Coat Color of Rabbits
Light gray
Dark gray Himalayan
Albino
Chinchilla
11.2 Complex Patterns of Inheritance
Chapter 11
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GenotypeBlood Type
IAIA A
IAi A
IBIB B
IBi B
IAIB AB
ii O
ABO Blood Type
• ABO blood type in humans is determined by three alleles:
IA IB i• IA and IB are codominant
alleles.• Both IA and IB are
dominant to the allele i.
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Complex Inheritance and Human Heredity
Multiple Alleles
Blood groups in humans
ABO blood groups have three forms of alleles.
11.2 Complex Patterns of Inheritance
Chapter 11
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Donor-recipient compatibilityRecipie
nt
Type A B AB O
A
Donor B
AB
O
= Unsafe transfusion
= Safe transfusion
Note:• Type O blood may be transfused into all the
other types = the universal donor.• Type AB blood can receive blood from all
the other blood types = the universal recipient.
© 2007 Paul Billiet ODWS