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1 | |
Which of the following pairs is incorrect? |
| | A) | sperm: gamete |
| | B) | diploid: 2n |
| | C) | diploid: gamete |
| | D) | egg: n |
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2 | |
At which stage does crossing-over occur? |
| | A) | metaphase I |
| | B) | anaphase I |
| | C) | prophase I |
| | D) | telophase I |
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3 | |
In which stage do chromosomes independently assort? |
| | A) | metaphase I |
| | B) | anaphase I |
| | C) | prophase I |
| | D) | telophase I |
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4 | |
Which of the following pairs is incorrect? |
| | A) | spermatid: haploid |
| | B) | primary spermatocytes: 2n |
| | C) | secondary spermatocytes: n |
| | D) | spermatogonia: n |
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5 | |
When do a woman's oocytes finish the process of meiosis? |
| | A) | conception |
| | B) | birth |
| | C) | puberty |
| | D) | menopause |
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6 | |
How do rates of sexually-transmitted diseases in the United States compare to the rest of the industrialized world? |
| | A) | U.S. rates are 4-5 times lower. |
| | B) | Rates in the two groups are roughly equal. |
| | C) | U.S. rates are 4-5 times higher. |
| | D) | U.S. rates are 50-100 times higher. |
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7 | |
Which gland is responsible for the production of reproductive hormones? |
| | A) | pituitary gland |
| | B) | thyroid |
| | C) | liver |
| | D) | digestive |
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8 | |
_________ chromosomes are of the same length, have the same types of genes in the same sequence, and have their centromeres in the same location—one came from the male parent and the other was contributed by the female parent. |
| | A) | Sex |
| | B) | Autosomes |
| | C) | Homologous |
| | D) | Paired |
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9 | |
The sex cells produced by male organisms are called |
| | A) | gametes. |
| | B) | diploid. |
| | C) | sperm. |
| | D) | All the above are true. |
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10 | |
How are sperm and egg cells formed so that they get only half the chromosomes of the diploid cell? |
| | A) | Meiosis |
| | B) | Mitosis |
| | C) | Asexual reproduction |
| | D) | Fertilization |
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11 | |
Which is incorrect when describing meiosis? |
| | A) | Single adult cell → Single gamete (sperm or egg) |
| | B) | Contains 2 sets of chromosomes → Contains 1 set of chromosomes |
| | C) | 2n → n |
| | D) | Single gamete → contains 2 sets of chromosomes |
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12 | |
In a diploid nucleus, the chromosomes occur as homologous chromosomes, |
| | A) | a pair of chromosomes in a diploid cell that contain similar genes throughout their length. |
| | B) | two chromosomes derived from the same parent. |
| | C) | chromosomes that have different phenotypes. |
| | D) | three chromosomes that contain identical alleles. |
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13 | |
In flowering plants, the_____ produces eggs or ova, and the_____ produces pollen, which contains sperm. |
| | A) | petal, flower |
| | B) | flower, anther |
| | C) | pod, leaf |
| | D) | pistil, anther |
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14 | |
During this stage, homologous chromosomes separate and their number is reduced from diploid to haploid. |
| | A) | Anaphase I |
| | B) | Metaphase II |
| | C) | Telophase II |
| | D) | Prophase I |
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15 | |
This exchange results in a chromosome with a new combination of genes, combinations of traits that were probably never found in the family before. |
| | A) | mutation |
| | B) | crossing-over |
| | C) | segregation |
| | D) | independent assortment |
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16 | |
A picture of an individual's chromosomal makeup is referred to as that person's |
| | A) | karyotype. |
| | B) | genotype. |
| | C) | genome. |
| | D) | phenotype. |
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17 | |
The total number of chromosomes becomes reduced during |
| | A) | Meiosis I. |
| | B) | Meiosis II. |
| | C) | Mitosis. |
| | D) | Synapse. |
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18 | |
While homologous chromosomes are paired they can exchange equivalent sections of DNA. This process is called |
| | A) | cleavage formation. |
| | B) | independent assortment. |
| | C) | synapse. |
| | D) | crossing-over. |
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19 | |
This chromosome in males appears to be primarily concerned with determining male sexual differentiation and has few other genes on it. |
| | A) | X |
| | B) | Y |
| | C) | Z |
| | D) | Autosome |
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20 | |
This process occurs during meiosis when chromosomes do not separate properly and the wrong number of chromosomes ends up in a gamete. |
| | A) | Meiosis II |
| | B) | Anaphase |
| | C) | Segregation |
| | D) | Nondisjunction |
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21 | |
The syndrome in which a person has an extra number 21 chromosome is known as |
| | A) | Down. |
| | B) | Turner. |
| | C) | Klinefelter. |
| | D) | Thomas. |
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22 | |
This chemical acts as a master switch that triggers the events that converts the embryo into a male. |
| | A) | SRY |
| | B) | TDF |
| | C) | ATP |
| | D) | DNA |
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23 | |
These people are designated as XO. |
| | A) | Down |
| | B) | Klinefelter |
| | C) | Turner |
| | D) | Thomas |
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24 | |
This genetic condition, XXY, is termed __________ syndrome, and probably the most common chromosomal variation found in humans. |
| | A) | Klinefelter's |
| | B) | Turner's |
| | C) | Down |
| | D) | Peters' |
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25 | |
The presence of this hormone results in the differentiation of male sexual anatomy and the absence of this same hormone results in the differentiation into female sexual anatomy. |
| | A) | Testosterone |
| | B) | Progesterone |
| | C) | Prolactin |
| | D) | Gonadotropin |
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26 | |
This hormone stimulates the development of follicles. |
| | A) | Gonadotropin |
| | B) | Oxytocin |
| | C) | Insulin |
| | D) | FSH |
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27 | |
Which is not an accessory gland in males? |
| | A) | seminal vesicle |
| | B) | bulbourethral gland |
| | C) | prostate |
| | D) | testes |
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28 | |
Men with sperm counts under __________ are often infertile. |
| | A) | 50 million/ml |
| | B) | 150 million/ml |
| | C) | 250 million/ml |
| | D) | none of these is correct |
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29 | |
During her lifetime, a female releases about __________ secondary oocytes. |
| | A) | 30 to 50 |
| | B) | 300 to 500 |
| | C) | 300,000 to 400,000 |
| | D) | Millions |
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30 | |
These hormones can regulate the release of oocytes from the ovary. |
| | A) | Fertility drugs |
| | B) | Contraceptive foams |
| | C) | Tubal ligation |
| | D) | Vasectomy |
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31 | |
This process involves surgically removing eggs from a woman's ovaries, combining them with sperm in the laboratory, and returning them to the woman's body or donating them to another woman. |
| | A) | Tubal ligation |
| | B) | Menstruation |
| | C) | Assisted Reproductive Technology |
| | D) | In vivo fertilization |
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