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| 1 | |
In 1882, Pierre-Joseph van Beneden, was surprised to find the same number of chromosomes in all cells of the roundworm Ascaris. |
| | A) | True |
| | B) | False |
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| 2 | |
A ________ cell contains two versions of each chromosome. |
| | A) | diploid |
| | B) | haploid |
| | C) | sperm |
| | D) | egg |
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| 3 | |
An organism reproduces either sexually or asexually but not both. |
| | A) | True |
| | B) | False |
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| 4 | |
In the sexual life cycle, there is an alternation of diploid and haploid phases. |
| | A) | True |
| | B) | False |
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| 5 | |
_____________ cells are genetically identical to the zygote from which they originated. |
| | A) | Somatic |
| | B) | Germ-line |
| | C) | Body |
| | D) | All of the above |
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| 6 | |
In animals, the completion of meiosis is followed soon by ____________. |
| | A) | mitosis |
| | B) | fertilization |
| | C) | asexual reproduction |
| | D) | all of the above |
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| 7 | |
Before the beginning of either meiosis or mitosis, the chromosomes have replicated during _______________. |
| | A) | Interphase |
| | B) | prophase I |
| | C) | metaphase I |
| | D) | anaphase I |
| | E) | telophase I |
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| 8 | |
During ___________, the homologous chromosomes line up side by side, physically touching one another at which point crossing over is initiated. |
| | A) | interphase |
| | B) | prophase I |
| | C) | metaphase I |
| | D) | anaphase I |
| | E) | telophase I |
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| 9 | |
During ____________, the random orientation of the chromosomes results in a shuffling of the chromosomes so that each daughter cell that results has a different combination of parental chromosomes. |
| | A) | interphase |
| | B) | prophase I |
| | C) | metaphase I |
| | D) | anaphase I |
| | E) | telophase I |
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| 10 | |
Meiosis II is simply a mitotic division involving the products of meiosis I, except that the sister chromatids are not genetically identical as they are in mitosis. |
| | A) | True |
| | B) | False |
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| 11 | |
The main outcome of the four stages of meiosis II---prophase II, metaphase II, anaphase II, and telophase II-is to separate ________________. |
| | A) | sister chromosomes |
| | B) | homologous chromatids |
| | C) | sister chromatids |
| | D) | homologous chromosomes |
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| 12 | |
At the end of meiosis II, each of the haploid cells contains ________ of every chromosome in the set. |
| | A) | one |
| | B) | two |
| | C) | 23 |
| | D) | 46 |
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| 13 | |
__________________ draws homologous chromosomes together all along their lengths creating an opportunity where two homologues can physically exchange portions of themselves. |
| | A) | Crossing over |
| | B) | Independent assortment |
| | C) | Synapsis |
| | D) | All of the above |
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| 14 | |
Reduction division produces diploid gametes thus ensuring that the chromosome number remains the same as the parents, following fertilization. |
| | A) | True |
| | B) | False |
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| 15 | |
Both mitosis and meiosis start with a diploid cell but the end result is haploid cells in meiosis and diploid cells in mitosis. |
| | A) | True |
| | B) | False |
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| 16 | |
In most respects, ____________ is identical to a normal mitotic division. |
| | A) | the first meiotic division |
| | B) | the second meiotic division |
| | C) | interphase I |
| | D) | interphase II |
| | E) | all of the above |
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| 17 | |
Sexual reproduction increases genetic variability through ______________. |
| | A) | independent assortment |
| | B) | crossing over |
| | C) | random fertilization |
| | D) | all of the above |
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| 18 | |
In humans there are more than 8 million different possible kinds of gametes that can be produced. |
| | A) | True |
| | B) | False |
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| 19 | |
Reproduction that involves the alternation of meiosis and fertilization is called asexual reproduction. |
| | A) | True |
| | B) | False |
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| 20 | |
Organisms that reproduce by mitotic division are practicing sexual reproduction. |
| | A) | True |
| | B) | False |
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