Exam 1 - Write your name on the back of the last page Exam...

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Page 1 of 7 Write your name on the back of the last page Exam 1 – September 17, 2004 ANSI3423 – Animal Genetics MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) A genetic cross in which the inheritance of two traits is observed is called a A) testcross. B) allelic cross. C) backcross. D) monohybrid cross. E) dihybrid cross. 2) In a certain type of plant, the gene for flower color has two alleles, blue and yellow. Heterozygous plants produce green flowers. This is an example of A) partial dominance. B) complete dominance. C) incomplete dominance. D) epistasis. E) codominance. 3) Mendel observed that some traits present in the parental generation disappeared in the F 1 , only to reappear in the F 2 . He concluded that A) dominant factors masked the expression of recessive factors in the F 1 generation. B) only dominant factors are expressed in the F 2 generation. C) recessive factors could only be detected in the parental generation. D) recessive factors were lost from the genotype during successive breedings. E) all of the above 4) Which of the following is a characteristic of recessive inheritance of a relatively rare trait? A) matings between two normal heterozygotes should produce an approximately 3:1 ratio of normal progeny to progeny exhibiting the recessive trait B) most affected individuals have two normal, heterozygous parents C) when both parents are affected, they are homozygous for the recessive trait and all their progeny will usually exhibit the trait D) all of the above E) none of the above 5) For traits that show incomplete dominance, the phenotype of a heterozygote is A) completely different from either the homozygous dominant or recessive phenotype.
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Page 2 of 7 B) the same as the homozygous dominant phenotype. C) intermediate between the homozygous dominant and homozygous recessive phenotypes. D) the same as the homozygous recessive phenotype. 6)
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This test prep was uploaded on 04/18/2008 for the course ANSI 3423 taught by Professor Desilva during the Spring '08 term at Oklahoma State.

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Exam 1 - Write your name on the back of the last page Exam...

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