5.2 variations of heredity
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5.2 Variations of Heredity. Pages 194-196. 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. Incomplete dominance in impatiens. - PowerPoint PPT PresentationTRANSCRIPT
5.2 Variations of Heredity
Pages 194-196
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.
Incomplete dominance in impatiens
Incomplete Dominance in Animals
Rex rabbit (short fur)crossed with angora rabbit (long fur)
Punnett Square
Codominance
Occurs when both alleles are expressed fully to produce offspring with a third phenotype.
Codominance in short horn cattle
Blood types
There are 3 alleles for bloodtype:
IA , IB , i
Blood
Alleles
• Each allele codes for a different enzyme that places different types of sugars on the surface of a red blood cell.
There are four types of blood
Type AType B
Type ABType O
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
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.
Blood types
Blood type O
The universal donor because people with every blood type can receive O-type blood without a danger of it clotting.
Blood Type AB
The universal recipient because people with AB blood can receive any type of blood