BIOL110 Exam 3 Mastering Bio Questions (answered)

BIOL110 Exam 3 Mastering Bio Questions (answered) A gene that affects the expression of a second gene is an example of __________________. A. pleiotropy B. codominance C. epistasis D. polygenic inheritance E. incomplete dominance C. epistasis __________ is an example of a character that is controlled by more than one gene (a quantitative character) and demonstrates a continuum of phenotypes. A. Pleiotropy B. Polygenic inheritance C. Epistasis D. Codominance E. Incomplete dominance B. Polygenic inheritance The gene controlling ear color in an organism known as a gizmo has two alleles that exhibit incomplete dominance: CR, which codes for red ears; and CY, which codes for yellow ears. Individuals that are homozygous for the CR allele have red ears, whereas the heterozygous genotype produces orange ears. Those that are homozygous for the CY allele have yellow ears. If two individuals with orange ears are crossed, what ratio of phenotypes should be expected in the offspring? A. 9:3:1, red:yellow:orange ears B. 3:1, red:yellow ears C. 1:2:1, red:orange:yellow ears D. 1:2:1, red:yellow:orange ears E. 1:3, red:yellow ears C. 1:2:1, red:orange:yellow ears Mice with the genotypes BBCc and bbcc are crossed. The alleles for brown coat (b) and no pigment (c) are recessive, and black coat (B) i s dominant. What color of mice would NOT be produced by this mating? A. brown B. white C. black A. brown An individual that is heterozygous for an allele and that exhibits a phenotype intermediate between that of the two homozygous alternatives is an example of _____. a.) polygenic inheritance b.) pleiotropy c.) codominance d.) incomplete dominance e.) epistasis d.) incomplete dominance What possible blood types could offspring have if their two parents have the blood types A and AB, respectively? A. AB only B .A, B, AB, and O C. A and O only D. A and B only E. A, B, and AB only E. A, B, and AB only In water snakes, body color is controlled by two alleles that display incomplete dominance. Snakes with the BB genotype are brown, those with the Bb genotype are gray, and individuals with the bb genotype are green. If a brown snake and a gray snake are crossed, what ratio of phenotypes should be expected in the offspring? A. 1:1, gray:green B. 1:2:1, brown:gray:green C. 1:1, brown:gray D.1:1:1, brown:gray:green1:1, brown:green C. 1:1, brown:gray You are examining a trait which shows three distinct phenotypes, with the phenotype of heterozygotes expressing both alleles seen in the homozygotes. This is an example of: A. Codominance. B. Complete dominance. C. Incomplete dominance. D. Pleiotrophy. A. Codominance. Pedigrees reveal that a trait shows a dominant pattern of inheritance if that trait generally _______. A. skipped generations B. was lethal C. did not skip generations D. was only inherited by males C. did not skip generations ________________________ is an example of a recessive inherited trait. A. Huntington's disease B.Cystic fibrosis C. Brachydactyly. D. The AB blood type