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| 1 | |
An egg and a sperm unite to form a new organism. In order to prevent the new organism from having twice as many chromosomes as its parents |
| | A) | half of the chromosomes in the new organism quickly die off, leaving the correct number. |
| | B) | half of the chromosomes from the egg, and half from the sperm, are ejected from the new cell. |
| | C) | the large egg contains all the chromosomes, the tiny sperm only contributes some DNA. |
| | D) | germ cells went through meiosis; the egg and sperm only have half the parental chromosomes. |
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| 2 | |
The diploid number of chromosomes in humans is 46. The haploid number is |
| | A) | 138. |
| | B) | 92. |
| | C) | 46. |
| | D) | 23. |
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| 3 | |
In organisms that have sexual life cycles there is a time when there are |
| | A) | 1n gametes (haploid), followed by 2n zygotes (diploid). |
| | B) | 2n gametes (haploid), followed by 1n zygotes (diploid). |
| | C) | 2n gametes (diploid), followed by 1n zygotes (haploid). |
| | D) | 1n gametes (diploid), followed by 2n zygotes (haploid). |
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| 4 | |
The purpose of meiosis I is to |
| | A) | duplicate all chromosomes. |
| | B) | randomly separate the homologous pairs, called independent assortment. |
| | C) | separate the duplicated sister chromatids. |
| | D) | divide the original material into four complete haploid cells. |
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| 5 | |
The purpose of meiosis II is to |
| | A) | duplicate all chromosomes. |
| | B) | randomly separate the homologous pairs, called independent assortment. |
| | C) | separate the duplicated sister chromatids. |
| | D) | divide the original material into four complete haploid cells. |
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| 6 | |
During which stage of meiosis does crossing over occur? |
| | A) | prophase I |
| | B) | anaphase I |
| | C) | metaphase II |
| | D) | interphase |
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| 7 | |
Synapsis is the process whereby |
| | A) | homologous pairs of chromosomes separate and migrate toward a pole. |
| | B) | homologous chromosomes exchange chromosomal material. |
| | C) | homologous chromosomes become closely associated. |
| | D) | the daughter cells contain half of the number of chromosomes of the parent cell. |
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| 8 | |
The purpose of mitosis is to ____, while the purpose of meiosis is to _____. |
| | A) | make diploid cells/make haploid cells |
| | B) | make haploid cells/make diploid cells |
| | C) | make cells which are either haploid or diploid/make cells which are haploid |
| | D) | make cells which are haploid/make cells which vary in chromosome number |
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| 9 | |
A major consequence of sex and meiosis is that each species |
| | A) | remains pretty much the same because the chromosomes are carefully duplicated and passed to the next generation. |
| | B) | has a lot of genetic reassortment due to what can happen in meiosis II. |
| | C) | has a lot of genetic reassortment due to what can happen in meiosis I. |
| | D) | has a lot of genetic reassortment due to what can happen in telophase II. |
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| 10 | |
Genetic diversity is greatest in |
| | A) | sexual reproduction. |
| | B) | asexual reproduction. |
| | C) | binary fission. |
| | D) | All of the above are equal in their amount of genetic diversity. |
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