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This activity contains 67 questions.

Question 1
1
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During asexual reproduction, yeast cells can produce _____.
 
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Question 2
2
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The term binary fission is best applied to _____.
 
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Question 3
3
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In bacterial cells, binary fission involves _____.
 
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Question 4
4
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A human bone marrow cell, in prophase of mitosis, contains 46 chromosomes. There are _____ chromatids.
 
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Question 5
5
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Individual chromosomes are usually observed with a light microscope during mitosis, even though cells spend more time in interphase. This is because _____.
 
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Question 6
6
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Chromatids are _____.
 
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Question 7
7
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A cell biologist carefully measured the quantity of DNA in grasshopper cells growing in cell culture. Cells examined during the G2 phase of the cell cycle contained 200 units of DNA. What would be the amount of DNA in one of the grasshopper daughter cells?
 
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Question 8
8
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DNA replication occurs in _____.
 
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Question 9
9
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Chromatids form _____.
 
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Question 10
10
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In the telophase of mitosis, the mitotic spindle breaks down and the chromatin uncoils. This is essentially the opposite of what happens in _____.
 
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Question 11
11
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At which point do centrosomes begin to move apart to the opposite poles of the cell in a dividing human liver cell?
 
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Question 12
12
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The phase of mitosis during which the chromosomes move toward separate poles of the cell is _____.
 
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Question 13
13
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During cell division, what role do centrosomes play?
 
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Question 14
14
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One event occurring during prophase is _____.
 
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Question 15
15
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Single sister chromatids are found in cells at mitotic _____.
 
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Question 16
16
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Which of the following is a correct representation of an event that occurs in mitosis?
 
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Question 17
17
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Which of the following occurs during mitosis?
 
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Question 18
18
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At which stage of mitosis are chromosomes lined up in one plane in preparation for their separation to opposite poles of the cell?
 
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Question 19
19
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The kinetochores are _____.
 
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Question 20
20
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In some organisms such as certain fungi and algae, cells undergo mitosis repeatedly without subsequently undergoing cytokinesis. What would be the consequence of this?
 
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Question 21
21
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Cytokinesis refers to _____.
 
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Question 22
22
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Consider the photograph shown below. You can determine this is a plant cell rather than an animal cell because it has _____.

Quiz Image
 
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Question 23
23
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Cytochalasin B is a chemical that disrupts microfilament formation. This chemical would interfere with _____.
 
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Question 24
24
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A cleavage furrow forms in an animal cell during _____.
 
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Question 25
25
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Which of the following conditions would result in inhibition of cell division due to density-dependent factors?
 
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Question 26
26
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Consider the cell cycle shown below. Cells will usually divide if they receive the proper signal at a checkpoint in the _____ phase of the cell cycle. Quiz Image
 
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Question 27
27
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What is the difference between a benign tumor and a malignant tumor?
 
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Question 28
28
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Observations of cancer cells in culture support the hypothesis that cancer cells _____.
 
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Question 29
29
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The function of mitosis is to produce daughter cells that _____.
 
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Question 30
30
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How many pairs of autosomes do humans have?
 
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Question 31
31
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Which of the following is a normal human female?
 
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Question 32
32
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In humans, the _____ determines the sex of the offspring because _____.
 
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Question 33
33
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An example of a cell that is 2n is a _____.
 
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Question 34
34
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After fertilization, the resulting zygote begins to divide by _____.
 
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Question 35
35
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When we say that an organism is haploid, we mean that _____.
 
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Question 36
36
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The diploid phase of the human life cycle begins with _____.
 
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Question 37
37
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At a critical point in meiosis, the chromosomes do not replicate. This occurs between _____.
 
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Question 38
38
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In anaphase I, _____.
 
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Question 39
39
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What is the typical result when a diploid cell undergoes meiosis?
 
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Question 40
40
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In a cell containing 10 chromosomes, meiosis results in the formation of daughter cells containing _____ chromosomes.
 
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Question 41
41
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At the end of telophase I of meiosis, as cytokinesis occurs, there are _____.
 
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Question 42
42
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Synapsis occurs during _____.
 
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Question 43
43
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During anaphase II, _____.
 
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Question 44
44
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During anaphase I, _____.
 
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Question 45
45
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Crossing over occurs during _____.
 
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Question 46
46
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An organism has a haploid chromosome number n = 4. How many tetrads will form during meiosis?
 
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Question 47
47
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Which event occurs only during prophase I of the first meiotic division?
 
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Question 48
48
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The function of meiosis is to make _____.
 
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Question 49
49
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Which of the following is a key difference between meiosis and mitosis?
 
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Question 50
50
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Mitosis and cytokinesis result in the formation of _____; meiosis and cytokinesis result in the formation of _____.
 
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Question 51
51
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Variation occurs when chromosomes are shuffled in _____.
 
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Question 52
52
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In humans, the haploid number of chromosomes is 23. Independent assortment has the possibility of producing _____ different gametes.
 
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Question 53
53
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If the diploid number of chromosomes in a certain animal is 6 (2n = 6), there are three sets of two homologous chromosomes each, or three pairs. How do these three pairs align and separate in meiosis?
 
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Question 54
54
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Consider the two mice shown below. They have the same chromosomes, carrying genes for the same traits in the same loci, but specifying different versions of the same traits—for example, coat and eye color. These chromosomes are called _____.

Quiz Image
 
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Question 55
55
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In the picture below, the chromosomal region where the nonsister chromatids are crossing over is called a(n) _____. Quiz Image
 
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Question 56
56
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Crossing over occurs during _____.
 
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Question 57
57
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Crossing over is important because it _____.
 
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Question 58
58
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Unless the chromosomes were stained to show band patterns, a karyotype would usually be unable to show _____.
 
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Question 59
59
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Consider the photograph of a karyotype. This is _____.

Quiz Image
 
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Question 60
60
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Why are individuals with an extra chromosome 21, which causes Down syndrome, more numerous than individuals with an extra chromosome 3 or chromosome 16?
 
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Question 61
61
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Each cell in an individual with Down syndrome contains _____ chromosomes.
 
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Question 62
62
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During meiosis, homologous chromosomes sometimes "stick together" and do not separate properly. This phenomenon is known as _____.
 
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Question 63
63
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Down syndrome can be the result of _____.
 
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Question 64
64
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Which of the following indicates Turner syndrome?
 
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Question 65
65
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Polyploidy is involved in which of the following examples?
 
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Question 66
66
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If a fragment of a chromosome breaks off and then reattaches to the original chromosome at the same place but in the reverse direction, the resulting chromosomal abnormality is called _____.
 
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Question 67
67
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The exchange of parts between nonhomologous chromosomes is called _____.
 
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