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What the . . . Punnett!!!• You and 1 partner:
1) Come up with a hypothesis of how this could be (“if” and “then”)
2) Make a punnett square to support your hypothesis
3) Be able to defend your hypothesis
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Beyond Mendel
Codominance and Incomplete Dominance
Mmmendel!
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•Polygenic InheritancePolygenic Inheritance
•Many genes code for that 1 trait
•Ex: • Eye color, • height, and • skin color
Order of dominance: brown > green > blue.
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• Multiple AllelesMultiple Alleles
•If there are more than two different alleles for that genein the gene pool.
•Example: ABO blood type (IA , IB and i).
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Incomplete Dominance
• Definition: A situation in which one allele is not completely dominant over another.
• The heterozygous phenotype is somewhere in between the two homozygous phenotype.
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Tricks of Incomplete Dominance• 1) Letters we use are both capitals because
both are dominant!
• 2) The offspring show a third phenotype
• 3) The offspring show a blending of the parental traits
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BlahBlahBlah!!!• Question: A cross between a blue
blahblah bird & a white blahblah bird produces offspring that are silver. The color of blahblah birds is determined by just two alleles. – 1) What are the genotypes of the parent
blahblah birds in the original cross? – 2) What is/are the genotype(s) of the silver
offspring?
– 3) What would be the phenotypic ratios of offspring produced by two silver blahblah birds?
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Codominance
• Definition: Situation in which both alleles of a gene contribute to the phenotype of an organism– Often produces offspring known as “eminette”
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Sickle Cell Anemia• Codominant
• A=normal, S=Sickle
• AA = Normal – Malaria
• AS = Hetero – No Malaria
• SS = Sickle – No Malaria