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| Front | Back |
 What is the final result of mitosis? A) Genetically identical 2n somatic cells B) Genetically identical 2n gamete cells C) Genetically identical 1n somatic cells D) Genetically different 2n somatic cells E) Both A and B are correct |
A
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 Based on structures present in the figure above, this cell is in which substage of interphase? A) G2 phase B) G1 phase C) G0 phase D) S phase |
A
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At which of the numbered regions in the figure above would you expect to find cells at metaphase?
A) I and II B) II only C) III only D) IV only E) V only |
C
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A plant-derived protein known as colchicine can be used to poison cells by blocking the formation of the spindle. Which of the following would result if colchicine is added to a sample of cells in G2?
A) The chromosomes would segregate but in a disorderly pattern B) The chromosomes would coil and shorten but have no spindle to which to attach C) The cells would immediately die D) The cells would be unable to begin M and stay in G2 |
B
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What is a major difference between mitosis and meiosis I?
A) Sister chromatids separate in mitosis, and homolgues separate in meiosis I B) DNA replication takes place prior to mitosis, but not before meisis I C) Sister chromatids separate in mitosis, and homologues separate in meiosis II D) Only meisis I results in daughter cells that contain identical genetic information |
A
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If a cell has completed the first meiotic division and is just beginning meiosis II, which of the following is an apporpriate description of its contents?
A) It has half the chromosomes but twice the DNA of the originating cell B) It has the same number of chromosomes but each of them has different alleles than another cell from the same meiosis C) It is identical in content to another cell from the same meiosis D) It has one-fourth the DNA and one-half the chromosomes as the originating cell E) It has half the amount of DNA as the cell that began meiosis |
E
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The karyotype of one species of primate has 48 chromosomes. In a particular female, cell division goes away and she produces one of her eggs with an extra chromosome (25). The most probable source of this error would be a mistake in which of the following?
A) Mitosis in her ovary B) Telophase I of one meiotic event C) Telophase II of one meiotic event D) Either anaphase I or II E) Metaphase I of one meiotic even |
D
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Genetic recombination takes place in which of the following processes?
A) Prophase II of meiosis B) Alignment of tetrads in metaphase I C) Random alignment of homologous chromosomes in meiosis I D) Crossing over |
D
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 You have isolated DNA from three different cell types of an organism, determined the relative DNA content for each type, and plotted the results on the graph shown above. Which choice below pair the correct cell with the DNA content of that cell? A) I = Gamete, II = Zygote, III = Cell in Metaphase I of meiosis B) Either A or B could be true; one cannot tell from DNA content alone C) I = Cell at the end of Meiosis II, II = gamete, II = Zygote D) I = Zygote, II = Cell in Prophase I of meiosis, III = Gamete E) Either I or II represents the DNA content of a zygote, II = a somatic cell |
D
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Independent assortment of chromosomes is a result of?
A) The random natur of the fertilization of ova by sperm B) The random distribution of the sister chromatids to the two daughter cells during anaphase II C) The random and independent way in which each pair of homologous chromosomes lines up at the metaphase plate during meiosis I, the random nature of the fertilization of ova by sperm, the random distribution of the sister chromatids to the two daughter cells during anaphase II, and the relatively small degree of homology shared by the X and Y chromosomes D) The random and independent way in which each pair of homologous chromosomes lines up at the metaphase plate during meiosis I E) The relatively small degree of homology shared by the X and Y chromosomes |
D
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A sexually reproducing pea plant has two unlinked genes, one for round pea shape (R) and one for tall plant height (T). Its genotype is Rrtt. Which of the following genotypes is possible in a gamete from this organism?
A) tt B) t C) Rr D) rt E) Rrtt |
D
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Two true-breeding stocks of pea plants are crossed. One parent has res, axial flowers and the other has white, terminal flowers; all F1 individuals have red, axial flowers, The genes for flower color and location assort independently. Among the F2 offspring, what is the probability of plants with white axial flowers?
A) 1/16 B) 9/16 C) 1/8 D) 1/4 E) 3/16 |
E
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Which of the following describes the ability of a single gene to have multiple phenotypic effects?
A) Incomplete dominance B) Polygenic inheritance C) Pleiotropy D) Multiple alleles |
C
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A man has extr digits (six fingers on each hand and six toes on each foot). His wife and their daughter have a normal number of digits. Having extra digits is a dominant trait. The couple's second child has extra digits. Wht is the probability that their next (third) child will have extra digits?
A) 1/8 B) 1/16 C) 3/4 D) 1/2 E) 9/16 |
D
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A recessibe allele on the X chromosome is responsible for red-green color blindness in humans. A woman with normal vision whose father is color blind marries a color-blind male. The couple has a son. What is the probability that he is color blind?
A) 100% B) 75% C) 50% D) 25% |
C
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