4.4-4.5 multiple alleles, incomplete dominance and codominance
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4.4-4.5 Multiple Alleles, Incomplete dominance and Codominance. Pages 143-145. Complete dominance. One allele is dominant over the other PP purple flowers Pp purple flowers pp white flowers. Incomplete Dominance. - PowerPoint PPT PresentationTRANSCRIPT
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4.4-4.5 Multiple Alleles, Incomplete dominance and Codominance
Pages 143-145
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Complete dominance
• One allele is dominant over the other• PP purple flowers• Pp purple flowers• pp white flowers
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Incomplete Dominance
Occurs when neither allele dominates the other and both have an influence on the individual.
Incomplete dominance results in partial expression of both traits.
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Incomplete dominance in impatiens
photo from: kids.britannica.com
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Incomplete Dominance in Animals
Rex rabbit (short fur)crossed with angora rabbit (long fur)
Photo from: buzzle.com
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Punnett Square
Image by: fhs-bio-wiki.pbworks.com
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CodominanceOccurs when both alleles are expressed fully to produce offspring with a third phenotype. (Polka dot)
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Codominance in short horn cattle
home.comcast.net hobart.k12.in.us
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Blood types
There are 3 alleles for bloodtype:
IA , IB , i
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Blood
medterms.com
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Alleles
• Each allele codes for a different enzyme that places different types of sugars on the surface of a red blood cell.
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There are three possible alleles for blood type
• i• IA
• IB
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There are four types of blood
Type AType B
Type ABType O
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Genotypes and Phenotypes
IA IA blood type AIB IB blood type BIA IB blood type ABIA i blood type AIB i blood type Bii blood type O
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Antigens
Type A blood has anti-B antigens. If a person with A-type blood receives B-type blood or AB-type blood, it will clot.
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Blood types
learn.genetics.utah.edu
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Blood type O
The universal donor because people with every blood type can receive O-type blood without a danger of it clotting.
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Blood Type AB
The universal recipient because people with AB blood can receive any type of blood