front 1 Which of the following is true of an X-linked gene, but not of a Y-linked gene? | back 1 The gene is present in both males and females. |
front 2 In general, the frequency with which crossing over occurs between two linked genes depends on what? | back 2 how far apart they are on the chromosome |
front 3 What is a nondisjunction? | back 3 An error in cell division that causes homologous chromosomes or sister chromatids to move to the same side of the dividing cell |
front 4 When can nondisjunction occur? Choose the best answer. | back 4 In mitosis, when sister chromatids fail to separate
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front 5 Which syndrome is characterized by the XO chromosome abnormality? | back 5 Turner Syndrome |
front 6 What kind of cell results when a diploid and a haploid gamete fuse during fertilization? | back 6 A triploid cell |
front 7 Of the following chromosomal abnormalities, which type is most likely to be viable in humans? | back 7 Trisomy |
front 8 If a diploid cell undergoes meiosis and produces two gametes that are normal, and one with n − 1 chromosomes, and one with n + 1 chromosomes, what type of error occurred? | back 8 A nondisjunction error occurred in meiosis II, in which both sister chromatids of a chromosome migrated to the same pole of the cell. |
front 9 If a diploid cell undergoes meiosis and produces two gametes with n + 1 chromosomes and two gametes with n− 1 chromosomes, what type of error occurred? | back 9 A nondisjunction error occurred in meiosis I, in which both members of a homologous pair migrated to the same pole of the cell. |
front 10 Humans are diploid and have 46 chromosomes (or two sets). How many sets of chromosomes are found in each human gamete? | back 10 1 |
front 11 Humans are diploid and have 46 chromosomes. How many chromosomes are found in each human gamete? | back 11 23 |
front 12 _____ is the process by which haploid gametes form a diploid zygote. | back 12 Fertilization |
front 13 A particular diploid plant species has 48 chromosomes, or two sets. A mutation occurs and gametes with 48 chromosomes are produced. If self-fertilization occurs, the zygote will have _____ set(s) of chromosomes. | back 13 4 |
front 14 Which of these terms applies to an organism with extra sets of chromosomes? | back 14 polyploid |
front 15 Mutant tetraploid plants _____. | back 15 are unable to interbreed with a diploid plant |
front 16 Most polyploid plants arise as a result of _____. | back 16 hybridization |
front 17 Which of the following results in a situation in which the chromosome number is either 2n+1 or 2n-1 ? | back 17 aneuploidy |
front 18 What results if a fragment of a chromosome breaks off and then reattaches to the original chromosome at the same place but in the reverse direction? | back 18 an inversion |
front 19 What phenomenon occurs when a particular allele will either be expressed or silenced, depending on whether it is inherited from a male or a female? | back 19 genomic imprinting |
front 20 How are human mitochondria inherited? | back 20 from mother only |
front 21 Cystic fibrosis is an inherited disorder that affects which of the following? | back 21 heart, liver, and lungs |
front 22 How long can sperm be cryogenically stored and still be viable? | back 22 for more than 20 years |
front 23 Which federal agency ensures that sperm donors are tested for communicable diseases? | back 23 Food and drug administration |
front 24 Which of the following is true? | back 24 Both women and men can be carriers for genetic disorders. |
front 25 Which of the following is a leading cause of sudden death among young athletes? | back 25 HCM |
front 26 What pattern of inheritance would lead a geneticist to suspect that an inherited disorder of cell metabolism is due to a defective mitochondrial gene? | back 26 The disorder would always be inherited from the mother. |
front 27 Which of these descriptions of the behavior of chromosomes during meiosis explains Mendel’s law of segregation? | back 27 The two alleles for each gene separate as homologous chromosomes move apart during anaphase I. |
front 28 Which of these descriptions of the behavior of chromosomes during meiosis explains Mendel’s law of independent assortment? | back 28 The arrangement of each pair of homologous chromosomes on the metaphase plate during metaphase I is random with respect to the arrangements of other pairs. |
front 29 Select the correct statement(s) about sex determination in animals. | back 29 The mechanism of sex determination varies with different animal species. |
front 30 Imagine a human disorder that is inherited as a dominant, X-linked trait. How would the frequency of this disorder vary between males and females? | back 30 Females would display this disorder with greater frequency than males. |
front 31 In humans, what determines the sex of offspring and why? | back 31 The male gamete determines sex because each male gamete can contribute either an X or a Y chromosome. |
front 32 What can we observe in order to visualize Mendel's Law of Segregation? | back 32 homologous chromosomes separating during meiosis I |
front 33 What name is given to the most common phenotype in a natural population? | back 33 wild type |
front 34 A white-eyed female Drosophila is crossed with a red-eyed male Drosophila. Which statement below correctly describes the results? | back 34 None of the females will have white eyes. |