Practice Genetics Midterm

Practice Genetics Midterm - Answers Biology 139 Genetics...

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1 Answers Biology 139 – Genetics Practice Midterm Exam W09 1. Two or more versions of the same gene exists in a population. This is referred to as: a. a monomorphic gene b. a polymorphic gene c. pleiotropism d. multiple alleles e. dihybrid 2. The genetic ratio 12:3:1, resulting from an F1 dihybrid cross, most likely indicates: a. complementary gene action b. codominance c. dominant epistasis d. recessive epistasis e. recessive lethality 3. A phenotypic ratio of 9:3:3:1 for offspring from a hybrid cross indicates: a. complementation b. two genes acting independently or together c. two alleles of a single gene acting independently d. multiple alleles of a single gene interacting e. none of the above 4. A striped cat from a pure-breeding stock was mated to a spotted cat from another pure-breeding stock, and the resultant progeny are all both spotted and striped. This indicates: a. dominant epistasis b. variable expressivity c. gene interaction d. codominance e. incomplete dominance 5. A gene which is monomorphic: a. has only one phenotypic expression b. has only one allele c. may have multiple alleles d. has one wildtype allele e. both c and d 6. Eye colour in cats is controlled by two polymorphic genes with two alleles each. Two cats, one with green eyes and one with yellow eyes, together produce 4 brown-eyed kittens. This occurs because of: a. the law of segregation b. the law of independent assortment c. incomplete dominance d. all of the above e. none of the above
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2 7. In the following pedigree, the indicated trait is most likely caused by what type of allele? a. autosomal recessive b. autosomal dominant c. X-linked recessive d. X-linked dominant e. Y-linked 8. In a cross between dihybrid LlBb individuals, where L represents long-haired which is completely dominant to l which represents short-haired, and B represents black which is completely dominant to b which represents white, what is the probability of any given offspring being both long-haired and white? Assume the two genes assort independently. a. 1/16 b. 1/4 c. 3/4 d. 3/16 e. 9/16 9. In a cross between two Bb cats where the allele for black fur colour ( B ) is dominant to that specifying brown fur colour ( b ), what is the probability that any given kitten born will be a brown female? a. 1 b. 1/2 c. 1/4 d. 1/8 e. none of the above 10. From the parental cross AABbCcDd x AaBbCcDd , what is the probability of obtaining a AaBbccDD offspring? a. 1/64 b. 1/32 c. 1/16 d. 1/256 e. 1/128
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3 11. Two heterozygous sheep carry the dominant allele for a black face. One has a black face, but the other only has a black cheek. This is an example of: a. codominance b. variable penetrance c. variable expressivity d. variable expressivity and penetrance e. all of the above 12. A cross between 2 individuals, each displaying antagonistic traits, results in a new phenotype in the single offspring. The new phenotype is a result of: a. dominant epistasis b. recessive epistasis c. incomplete dominance d. gene interaction
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Practice Genetics Midterm - Answers Biology 139 Genetics...

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