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Download 1. The father of genetics is_____. A. Charles Darwin B
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2. The inability of the dominant allele to make up for the presence of the recessive allele is associated with _____. A. codominance B. epistasis ___ C. incomplete dominance D. pleiotropy 4. If the allele for red petals is not completely dominant to the allele for white petals, when a truebreeding plant with red petals is crossed with a true breeding plant with white petals, the offspring will ____. A. all have red petals B. all have pink petals ___ C. all have white petals D. all have red and white petals 5. When the plants with pink petals (R1R2) are allowed to self-pollinate, the phenotypic ratio of the offspring will be _____. A. 3:1 B. 1:1:1:1 C. 1:2:1 ___ D. 9:3:3:1 8. The appearance of both A and B types of glycoproteins on the red blood cells of the people with AB blood type is an example of _______. A. codominance ___ B. polygenic inheritance C. epistasis D. incomplete dominance 9. In _____, genes at two different loci interact to control a single trait. A. codominance B. pleiotropy C. polygenic inheritance D. epistasis ___ 10. Albinism is the result of _____. ___ A. epistasis B. pleiotropy C. codominance D. incomplete dominance 11. If sweet peas are _____ in either gene for pigmentation, a lack of color results. A. homozygous dominant B. heterozygous C. homozygous recessive ___ 12. An absence of color occurs when _____. A. a gene is absent B. an enzyme in a metabolic pathway is ___ missing C. at least one dominant allele is present 13. Polygenic inheritance occurs when one trait is governed by many genes occupying different loci on ______. A. the same homologous pair of chromosomes B. different homologous pairs of chromosomes C. either A or B ___ D. neither A or B 14. More than two possible phenotypes for a particular trait can be attributed to inheritance by _____. A. simple dominance ___ B. multiple alleles C. epistasis D. pleiotropy 15. Blood type in humans is controlled by _____ allele(s). A. one B. two ___ C. three D. four 17. When there is a range of phenotypes, the inheritance is _____. A. polygenic ___ B. codominant C. incompletely dominant D. pleiotropic 19. When individuals make an abnormal form of the extracellular matrix protein, fibrillin, which affects many other traits, the inheritance is the result of ______. A. codominance B. multiple alleles C. simple dominance ___ D. pleiotropy 20. More phenotypes than expected may result from polygenic inheritance because of _____. A. multiple alleles B. codominance ___ C. environmental effects D. pleiotropy 22. Height in humans is affected by _____. A. polygenic inheritance B. environmental effects such as nutrition ___ C. both A and B 23. Environmental conditions can influence _____. A. the skin color of humans B. the fur color of rabbits C. the appearance of a water buttercup D. all of the above ___ 27. Which of the following supports the chromosomal theory of inheritance? A. both chromosomes and alleles are paired in diploid cells B. homologous chromosomes and alleles separate during meiosis C. fertilization restores both the diploid chromosome number and___ allele pairs in the zygote. D. all of the above 28. Who determines the sex of the child? A. the male ___ B. the female 30. The sex chromosomes of a human female are _____. A. XX ___ B. XY C. YY 33. Male and female Drosophila flies have _____. A. the same number of chromosomes as humans B. one pair of sex chromosomes C. the same number of sex chromosomes as humans D. both B and C ___ 34. The allele for Drosophila eye color ____. A. is on the Y chromosome ___ B. is on the X chromosome C. is on one of its autosomes 37. Which of the following best describes a Drosophila with the genotype XRXr assuming XR = red eyes and Xr = white eyes? A. female with red eyes B. female that is a carrier C. male with white eyes ___ D. both A and B 38. Assuming XR = red eyes and Xr = white eye, what is the phenotype of an individual with the genotype XrY? A. male with red eyes B. male with white eyes ___ C. female with red eyes D. female with white eyes 39. An individual with the genotype XrY will produce which of the following gametes? A. XR B. Xr C. Y ___ D. both B and C 43. If XB = normal vision and Xb = color blindness, what are the chances a color blind female will have color blind sons if she has children with a man with normal vision? ___ A. 100% B. 50% C. 25% D. none 44. What are the chances of a female, homozygous for normal vision, and a color blind male having color blind daughters? A. 100% B. 50% C. 25% ___ D. none 45. Carriers can also be described as _____. A. homozygous recessive B. homozygous dominant ___ C. heterozygous 47. There is a direct relationship between the frequency of crossing-over and the percentage of recombinant __________. A. gametes B. phenotypes C. genotypes ___ 48. The chromosomes can be mapped by determining the frequency of recombinant _____ that occurs due to the process of crossing over. ___ A. gametes B. phenotypes C. genotypes 49. Drosophila chromosome II carries the gene for _____. A. antennae type B. wing type C. leg length ___ D. all of the above 50. If crossing over occurs between two linked alleles of interest, a dihybrid produces _____ type(s) of gamete(s). A. one B. two C. three D. four ___ 51. When chromosomes are mapped by examining recombinant phenotypes, it is assumed that 1% of crossing over equals _____ map unit(s). ___ A. one B. two C. five D. ten 52. When individuals heterozygous for two traits that have linked alleles are crossed the expected phenotypic ratio of the offspring is _____. A. 1:1:1:1 B. 1:1 ___ C. 3:1 D. 9:3:3:1 53. When a cross involving mutant genes b and e is done 3% recombinants are observed. When a cross involving mutant genes t and e is done 22% recombinants are observed. When a cross involving mutant genes b and t is done 19% recombinants are observed. What is the correct order of the genes on the chromosome? A. t, b, e ___ B. b, t, e C. t, e, b 55. It is estimated that __________ of all flowering plants are polyploids. A. 21% B. 47% ___ C. 68% D. 92% 56. Triploids have _____ of each kind of chromosome. A. one B. two ___ C. three D. four 57. Nondisjunction can occur during meiosis I if _____. ___ A. members of a homologous pair fail to separate B. the daughter chromosomes fail to separate and instead go into the same daughter cell C. both A and B 59. When an individual has only one of a particular type of chromosome it's described as _____. A. monosomy ___ B. disomy C. trisomy D. tetrasomy 62. Down syndrome is a _____. A. monosomy B. disomy ___ C. trisomy D. tetrasomy 63. In humans, Turner syndrome _____. A. is a monosomy B. involves the sex chromosomes C. results in a female D. all of the above ___ 64. Nondisjunction can occur during _____. A. anaphase I B. anaphase II ___ C. both A and B 65. A trisomy occurs when an individual has three of _____. A. a particular type of chromosome ___ B. each kind of chromosome C. both A and B 67. Polyploidy generally results from _____. A. mutation B. hybridization ___ C. nondisjunction 68. Which of the following is a polyploid? A. wheat B. watermelons C. cotton D. all of the above ___ 70. A(n) _____ is the movement of a segment of a chromosome from one chromosome to another nonhomologous chromosome. A. inversion ___ B. translocation C. deletion D. duplication 71. When a broken segment from one chromosome attaches to its homologue a(n) _____ occurs. A. duplication B. deletion C. inversion ___ D. both A and B 72. Which of the following may result in abnormal gametes and offspring? A. inversion B. translocation C. deletion ___ D. all of the above 75. Down syndrome that tends to run in the family of either the mother or father is the result of _____. A. deletion B. inversion C. duplication D. translocation ___ 76. Cri du chat syndrome is the result of a(n) _____. A. inversion B. translocation C. deletion D. duplication ___ 78. Chromosomes may be broken by _____. A. viruses B. radiation C. certain organic chemicals D. all of the above ___ 79. A(n) _____ occurs when a segment of chromosome is turned around 180o. A. inversion ___ B. translocation C. deletion D. duplication