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Incomplete Dominance, Codominance, and Multiple Alleles (Fill in notes: See ppt for word bank) dominance •This is when neither allele is . •Both are expressed and contribute equally to the phenotype. •A genotype has an intermediate phenotype as there is influence from both alleles. This is also known as . • Example : Red + White = . flower flower flower • Example genotype: Snapdragons can be –red (alleles = ) –white (alleles = ) –pink (alleles = Rr ) Stop using the word bank here. If you feel comfortable you can complete Q1 or you can wait until I give you directions. Q1. If you cross a two pink flowers, is it possible to produce a white flower? Codominance •Both alleles are . •They are , so there is no 'blending' as in the snapdragons, instead the phenotype is a result of the full expression of alleles. ● Example : dog + White dog = Black & White spotted dog ● Example : red cow + White cow = cow (remember the cool moo moo!) ● Example genotype: Dogs can be: Black (alleles = ) (alleles = bb) Spotted (alleles = ) Stop using the word bank here. If you feel comfortable you can complete Q2 or you can wait until I give you directions. Q2. Is it possible for a black dog to have one parent that is white? Multiple alleles ( typing) In the case of the ABO blood grouping, there are alleles for one gene They are written a little differently: • : this allele is recessive • IA : this allele is . • IB : this is codominant Blood group ( ): A Possible genotype: AA I I or . B B or I i AB A B I I O . Q3. A father with homozygous type A blood has a child with a mother that has heterozygous type B blood. •Is it possible for them to have a child with type O blood? Challenge: Q4. What blood type is the universal donor? Q5. What blood type is the universal recipient?
