1) A(n) ______ is an example of an organism that can sometimes reproduce asexually. |
C) Komodo dragon |
2) Ordinary cell division produces two daughter cells that are genetically identical. This type of cell division is important for all of the following functions EXCEPT |
C) production of sperm and eggs |
3) The chromosomes of eukaryotic cells are found in the ______. |
A) nucleus |
4) Chromatin consists of ______. |
A) DNA and protein |
5) A duplicated chromosome consists of two ______. |
D) sister chromatids |
6) Sister chromatids are joined at the ______. |
A) centromere |
7) Which of the following occurs during interphase? |
B) Chromosome duplication |
8) The cell cycle results in the production of ______. |
C) two cells, each with the same amount of genetic material and the same genetic information |
9) Which of the following occurs during prophase? |
D) The mitotic spindle begins to form. |
10) Which of the following is a stage of mitosis? |
B) telophase |
11) The correct sequence of stages of mitosis is ______. |
A) prophase, metaphase, anaphase, telophase |
12) During metaphase ______. |
D) chromosomes line up in the middle of the cell |
13) Which of these events occurs during anaphase? |
A) Sister chromatids separate. |
14) During telophase ______. |
A) the events of prophase are reversed |
15) A cell that completed the cell cycle without undergoing cytokinesis would ______. |
D) have two nuclei |
16) Cytokinesis typically begins during the ______ stage of mitosis. |
A) telophase |
17) What is the difference between a benign and a malignant tumor? |
C) Benign tumors do not metastasize; malignant tumors do. |
18) Which of the following will help prevent cancer and increase survival? |
C) Seek early detection of tumors. |
19) Homologous chromosomes ______. |
A) carry genes controlling the same inherited characteristics |
20) What chromosomes belong to a normal human male? |
C) 44 autosomes, one X chromosome, and one Y chromosome |
21) What chromosomes belong to a normal human female? |
B) 44 autosomes and 2 X chromosomes |
22) Chromosomes that do not determine the sex of an individual are called ______. |
D) autosomes |
23) Sexual intercourse in humans ______. |
A) allows a haploid sperm cell to fertilize a haploid egg cell |
24) In meiosis, how does prophase I differ from prophase II? |
A) During prophase I there is one diploid cell; during prophase II there are two haploid cells. |
25) How much genetic material is present in a cell during prophase I compared to a cell that has completed meiosis II? |
B) four times as much |
26) During metaphase I, ______. |
B) homologous chromosomes line up in the middle of the cell |
27) Upon completion of telophase I and cytokinesis, there is(are) ______ cell(s). |
C) two haploid |
28) Which of the following is a characteristic seen in prophase I that does not occur in prophase II? |
D) Crossing over occurs. |
29) Anaphase II is essentially the same as mitotic anaphase except that in anaphase II ______ and in mitotic anaphase ______. |
D) the cells are haploid and sister chromatids separate… the cells are diploid and sister chromatids separate |
30) One difference between mitosis and meiosis is ______. |
A) mitosis produces cells genetically identical to the parent cell, but meiosis does not |
31) Genetic variation is accomplished by all but one of the following. Which is it? |
D) the events of meiosis II |
32) Which of the following is the best description of the events of anaphase I? |
C) Homologous chromosomes randomly separate and migrate to opposite poles. |
33) For a species with four pairs of chromosomes, ________ chromosome combinations are possible. |
C) 16 |
34) A ______ describes a site of crossing over. |
A) chiasma |
35) Crossing over during prophase I results in ______. |
D) genetic recombination |
36) A karyotype (a chromosome display) would be unable to determine ______. |
D) eye color |
37) How many chromosomes can a gamete possess as a result of nondisjunction? |
A) n + 1 or n – 1 |
38) How many chromosomes does an individual with Turner syndrome have? |
C) 2n – 1 |
39) Examine the figure below. Nucleosomes are made of ______. |
D) DNA and histone proteins |
40) As shown in the following figure, plant cell cytokinesis differs from animal cell cytokinesis because ______. |
B) plant cells form a cell plate and animal cells do not |
41) This diagram of the human life cycle shows that ______. |
B) meiosis produces haploid sperm and egg cells |
42) The following figure shows that ______. |
A) meiosis results in the formation of four haploid daughter cells |
Amanda’s parents realized that her body was not developing properly about the time she was 12 years old. She was shorter than most of her friends and was not going through changes normally associated with female puberty. They took her to a doctor who initially diagnosed Amanda with Turner Syndrome because of her physical features. He ordered a karyotype that confirmed his diagnosis. Amanda was born with only one X chromosome. Although there is no specific cure, the doctor was able to treat her and correct some of the problems associated with the condition. For example, she received growth hormone to improve her growth and estrogen to help her develop the physical changes of puberty.
Amanda’s abnormal number of sex chromosomes resulted from ________. Amanda’s parents realized that her body was not developing properly about the time she was 12 years old. She was shorter than most of her friends and was not going through changes normally associated with female puberty. They took her to a doctor who initially diagnosed Amanda with Turner Syndrome because of her physical features. He ordered a karyotype that confirmed his diagnosis. Amanda was born with only one X chromosome. Although there is no specific cure, the doctor was able to treat her and correct some of the problems associated with the condition. For example, she received growth hormone to improve her growth and estrogen to help her develop the physical changes of puberty.
Amanda’s abnormal number of sex chromosomes resulted from ________. |
C) Nondisjunction |
BIO 101 Chap 8
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