front 1 A(n) ___ within a chromosome changes the amount of DNA in that chromosome. translocation inversion deletion point mutation | back 1 Answer: C |
front 2 A ___ inversion is a rearrangement of DNA that involves the centromere. translocated pericentric submetacentric paracentric | back 2 Answer: B |
front 3 _________ results in multiple complete chromosome sets. Tandem duplication Nondisjunction Aneuploidy Polyploidy | back 3 Answer: D |
front 4 A mutation event occurs in which two different (nonhomologous) chromosomes end up with a small piece of the other. This mutation is a(n) paracentric inversion. intrachromosomal translocation. intrachromosomal duplication. interchromosomal translocation. | back 4 Answer: D |
front 5 Chromosomal mutations in prokaryotes or eukaryotes may occur as the result of exposure to chemicals. Therefore, all the choices listed are correct. as the result of exposure to radiation. spontaneously All of the choices listed are correct. | back 5 Answer: D |
front 6 Dicentric or acentric chromosomes may arise as a result of translocation. paracentric inversion. duplication. deletion. | back 6 Answer: B |
front 7 For which type of chromosomal mutation would it be impossible to revert to wild type? deletion translocation duplication inversion | back 7 Answer: A |
front 8 During cell division, a dicentric chromosome typically experiences _______ while an acentric chromosome is ________________. duplication; unaffected inversion; unaffected breakage; reintegrated breakage; lost | back 8 Answer: D |
front 9 Humans have ___ complete set(s) of ___ chromosomes. one; 23 two; 23 one; 46 two; 46 | back 9 Answer: B |
front 10 Which of the following human disorders is NOT caused by aneuploidy? Down syndrome Cri-du-chat syndrome Edwards syndrome Patau syndrome | back 10 Answer: B |
front 11 In pseudodominance, the dominant allele of a gene is ______, and the recessive allele is _________. deleted; expressed expressed; masked expressed; deleted deleted; masked | back 11 Answer: A |
front 12 Monoploidy is rarely seen in adults of normally diploid organisms because meiosis is affected. mitosis is affected. recessive alleles are uncovered. recessive lethal mutations are uncovered. | back 12 Answer: D |
front 13 Prader-Willi syndrome is associated with a deletion of part of which chromosome? 1 5 15 21 | back 13 Answer: C |
front 14 The sons of a woman with one fragile X chromosome have a ___ chance of inheriting the mutation. 0% 25% 50% 100% | back 14 Answer: C |
front 15 The order of genes on a particular DNA segment is A-B-C-D-E . After a chromosomal mutation, the order is A-D-C-B-E . This mutation is a(n) translocation. duplication. inversion. deletion. | back 15 Answer: C |
front 16 The phenotypic effects of fragile X syndrome are exhibited primarily in males. females. approximately equal numbers of males and females. XXY females. | back 16 Answer: A |
front 17 The Philadelphia chromosome observed in people with chronic myelogenous leukemia results from which chromosomal mutation? terminal tandem duplication reciprocal translocation pericentric inversion deletion | back 17 Answer: B |
front 18 The sequence of genes on a particular region of the chromosome is A-B-C-D-E . After a chromosomal mutation, the sequence is A-B-C-C-B-D-E . This is a(n) ___ mutation. reverse tandem duplication intrachromosomal translocation paracentric inversion None of the choices listed is correct. | back 18 Answer: A |
front 19 Polyploidy is more commonly found in plants than in other normally diploid organisms. What are possible reasons? Plants can self-fertilize. Many plants are naturally polyploid. Plants can be propagated vegetatively. All of the reasons listed may contribute to the natural phenomenon of polyploidy in plants. | back 19 Answer: D |
front 20 Which of the following types of aneuploidy would be LEAST likely to cause problems in meiosis? monosomy trisomy tetrasomy All of the choices listed are equally likely to cause problems in meiosis. | back 20 Answer: C |
front 21 In polytene chromosomes from Drosophila, genes are found in the chromocenter. bands. interbands. bands and interbands. | back 21 Answer: D |
front 22 Individuals with Down syndrome have ___ of chromosome 21. one copy two copies three copies no copies | back 22 Answer: C |
front 23 Polyploidy is rare in mammals, but is commonly found in birds and reptiles. algae and birds. amphibians and plants. insects and fungi. | back 23 Answer: C |
front 24 Chimpanzees and gorillas have a chromosomal complement of 2N = 48, whereas humans have 2N = 46. Genetic analysis has revealed that two chromosomes in the apes chromosomes show homology with human chromosome 2. This is a good example of ________ in evolution. Robertsonian fusion duplication inversion All of the choices listed are correct. | back 24 Answer: A |
front 25 A meiotically or mitotically heritable change in gene expression that does not involved a change in the DNA sequence of the affected gene(s) is referred to as cytogenetics. epigenetics. euploidy. pseudodominance. | back 25 Answer: B |