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22 Cards in this Set
- Front
- Back
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This type of chromosome provides the basis for sex determination in many sexually reproducing organisms? |
sex chromosomes |
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In Drosophila virilis, nuclei of somatic cells contain 12 chromosomes while nuclei of sperm cells contain only 6 chromosomes. What does "n" equal for this species? |
6 |
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The stage of mitosis when chromosomes condense to form rod-shaped structures visible under the microscope is called |
prophase |
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stage of mitosis when sister chromatids separate from each other and migrate to opposite poles of a cell is called............. |
anaphase |
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During which stages of the cell cycle would a chromosome consist of only a single chromatid? |
G1 |
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6. Which of the following statements applies to homologous chromatids? A. They are attached to the same centromere. B. They are genetically identical. C. They segregate from each other at anaphase of mitosis. D. They contain the same genes in the same order but may have different alleles of some genes. E. More than one statement applies to homologous chromatids. |
They contain the same genes in the same order but may have different alleles of some genes. |
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Crossing over between homologous chromosomes occurs at which stage of meiosis? |
prophase I |
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Humans have 22 pairs of autosomes plus one sex chromosome pair. How many autosomes are present in a normal human primary spermatocyte? |
44 |
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At which stage(s) of meiosis would homologous chromosomes be paired? |
both prophase of meiosis I and metaphase of meiosis I. |
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Which of the following events occurs during mitosis but not during meiosis? A. segregation of sister chromatids B. pairing of homologous chromosomes C. crossing-over between homologous chromosomes D. alignment of chromosomes on the metaphase plate E. none of the choices is correct |
E |
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20. The chromosomal structure to which spindle fibers attach during the mitotic divisions is referred to as a A. chromatid. B. centrosome. C. kinetochore. D. metaphase plate. E. centromere. |
C. kinetochore |
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22. Mitosis results in _______ chromosome number, whereas meiosis results in _______ chromosome number. A. a doubling of, no change in B. no change in, no change in C. a reduction by half in, no change in D. no change in, a doubling of E. no change in, a reduction by half in |
E. no change in, a reduction by half in |
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23. Cells said to be in the G0 stage A. have two chromatids per chromosome. B. are replicating their chromosomes. C. are about to enter the mitotic phase of the cell cycle. D. are in an extended G1 phase and no longer cycling. E. are dead. |
D. are in an extended G1 phase and no longer cycling. |
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What comes after the G1 phase of the cell cycle? |
S |
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During which phase of the cell cycle is DNA replicated? |
The S phase |
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Cells in the G2 stage of the cell cycle have ______ as cells of the same species in the G1 stage. A. twice as many chromosomes B. twice as many chromatids C. half as many chromatids D. the same number of chromatids E. half as many chromosomes |
B. twice as many chromatids |
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A cross between a white-eyed female fruit fly and a red-eyed male would generate which of the following types of progeny? A. red-eyed females and white-eyed males B. white-eyed females and red-eyed males C. all red-eyed females and a 50:50 mixture of white-eyed and red-eyed males D. all red-eyed males and a 50:50 mixture of white-eyed and red-eyed females E. The result cannot be predicted because it depends on whether the female is homozygous or heterozygous |
A. red-eyed females and white-eyed males |
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Red green color blindness is controlled by an X chromosomal gene in humans. A normal man and normal woman whose fathers are both color blind marry. What is the probability that their first child will be color blind? A. 1/2 B. 1/4 C. 1/8 D. 1/3 E. 0 |
B. 1/4 |
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Hemophilia is caused by an X-linked recessive mutation in humans. If a woman whose paternal uncle (father's brother) was a hemophiliac marries a man whose brother is also a hemophiliac, what is the probability of their first child having hemophilia (Note: assume that there are no other cases of hemophilia in the pedigree and no hidden carriers)? A. 0 B. 1/4 C. 1/2 D. 1/8 E. 1 |
A. 0 |
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30. Males with one copy of an X-linked gene are said to be _________ for that gene. A. homozygous B. heteroallelic C. heterozygous D. hemizygous E. deficient |
D. hemizygous |
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Which of the following ratios show codominance? A. 2:1 B. 3:1 C. 1:2:1 D. 1:1 E. 4:1 |
C. 1:2:1 |
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The gene that controls ABO blood type phenotype demonstrate which of the following inheritance patterns? A. complete dominance. B. recessiveness. C. codominance. D. complete dominance, recessiveness, and codominance E. none of the choices is correct. |
D. complete dominance, recessiveness, and codominance |
