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Unformatted text preview: MEGA PRACTICE TEST Codominance a. involves heterozygotes showing an intermediate between those of the two homozygotes. b. involves the expression of both alleles at a locus producing two different phenotypes. c. is only found in mammalian enzyme production. d. involves one allele having more than one phenotypic effect. e. would result in pink flowers from a cross between white and red flowers. In pea plants, the gene for yellow seeds, Y, is dominant to the allele for green seeds, y. A plant with green seeds must have the genotype a. YY. b. Yy. c. yy. d. a. and b. e. All of the above Coat color in mice involves the effects of multiple gene interactions. If a mouse has two recessive alleles (aa) for coat color, he is always albino no matter what the genotype is for the other genes involved in coat color. This is an example of a. pleiotropy. b. incomplete dominance. c. codominance. d. epistasis. e. heterosis. Homologous chromosomes in meiosis a. do not segregate at all. b. do not segregate independently of one another. c. can only adopt one alignment. d. can adopt two different alignments. e. None of the above Different genes always assort independently whether the genes reside on the same chromosome or on different chromosomes. a. True b. False What fraction of offspring of the cross AaBb X AaBb is homozygous for all the dominant alleles, assuming that they are on different chromosomes? a. 1/4 b. 1/8 c. 1/16 d. 1/32 e. 1/64 _______ is the term meaning an allele that has more than one distinguishable phenotypic effect. a. Pleiotropy b. Incomplete dominance c. Codominance d. Epistasis e. Heterosis In humans, brown spotting of teeth is caused by a dominant sex-linked (X-linked) gene. If a man with brown teeth marries a woman with normal teeth, a. all of their children have brown teeth. b. all of their sons have brown teeth. c. all of their daughters have brown teeth. d. half of their daughters have brown teeth. e. none of their children have brown teeth. Incomplete dominance a. results in a phenotypic ratio of 1:2:1 in a monohybrid cross. b. is far less common than complete dominance. c. is the same thing as codominance. d. involves the distinct expression of both alleles as in the ABO blood group system. e. occurs only in X-linked genes. In many animals, including humans, sex is determined by a single _______, or by a pair of them. Both males and females have two copies of each of the rest of the chromosomes, which are called _______ a. autosome/sex chromosomes....
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