Genetics handout week 6

Genetics handout week 6 - Greg Tyson [email protected] OH...

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Greg Tyson [email protected] OH: Mondays, 5-6 Week 6 handout Chapter 3 problems: 13-15, 17-19, 21-25, 29-31 1. A ________ allele requires only one copy to be expressed. 2. A ________ allele requires two copies to be expressed. 3. Someone who is ___________ for a gene has two different alleles. 4. Someone who is ___________ for a gene has two copies of the same allele. 5. A ________ is the expression of a measurable characteristic. A ______ is the region on a chromosome occupied by an allele. 6. True/False: Type O blood is not a phenotype because you cannot see it. 7. When an individual of unknown genotype with dominant phenotype is crossed with an individual that is homozygous recessive, this is called a _____ _______. 8. Genotypic and phenotypic ratios of crosses: Heterozygous X Heterozygous : Heterozygous X Homozygous recessive : 9. Bill has blue skin, which is recessive. Both his parents have the dominant green skin. Is this possible? What are the genotypes of his parents? 10. The ______ rule states that the probability of two independent events occurring together is calculated by _______ the probabilities of the two events.
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