Genetics Questions Key_F08

Genetics Questions Key_F08 - KEY: BIOLOGY 100 GENETICS...

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KEY: BIOLOGY 100 GENETICS PROBLEMS 1. a. Since all cows have the recessive phenotype, all must be the homozygous recessive genotype ( bb ). b. Since all calves have the dominant phenotype, we presume that the bull is the homozygous dominant genotype ( BB ). c. If the cows are bb and the bull is presumed to be BB , then the calves are presumed to be Bb . 2. a. If the child is an albino, its genotype must be homozygous recessive ( aa ); for normal phenotype parents to produce an albino child, they must both be Aa (heterozygous). b. The probability of the offspring of a monohybrid cross having the dominant phenotype is 3/4 . 3. One-half of the gametes produced by an individual with gentoytpe Bb will contain allele B and the other half will contain allele b . An individual with genotype AaBb will produce gametes AB , Ab , aB and ab in equal proportions.? An individual with genotype AaBB will produce gametes AB and aB in equal proportions. 4. For Mary and her mother to both have the recessive phenotype, they must both
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This note was uploaded on 09/25/2010 for the course MATH 150 taught by Professor Shen during the Spring '08 term at San Diego State.

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Genetics Questions Key_F08 - KEY: BIOLOGY 100 GENETICS...

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