1. Which stage occurs before stage Y shown in the diagram?
A. Prophase
B. Metaphase
C. Anaphase
D. Telophase
2. In the cell Y, sister chromatids are
...
A. separating
B. joined together
C. doubling in size
D. halving in size
3. What are the correct characteristics of cytokinesis?
I. Cytokinesis is division of all organelles in the cell
II. Both daughter cells must receive at least one mitochondrion and organelles that can only be produced by dividing a pre-existing structure.
III. Oogenesis in human is an example of unequal cytokinesis
A. I and II only
B. II and III only
C. I, II, and III
D. I and III only
4. Which process occurs in meiosis but not in mitosis?
A. Attachment of spindle fibres to the centromeres of each chromosome
B. Movement of homologous chromosomes to opposite ends
C. Replication of DNA prior to the start of cell division
D. Condensation and movement of chromosomes to opposite poles
5. What is the correct definition of meiotic cell division?
A. One haploid nucleus divides by meiosis to produce four diploid nuclei
B. One diploid nucleus divides by meiosis to produce four haploid nuclei
C. One diploid nucleus divides by meiosis to produce four diploid nuclei
D. One haploid nucleus divides by meiosis to produce four haploid nuclei
6. In meiosis the nucleus undergoes two divisions. Which of the statements about meiosis I is correct?
A. The number of chromatids is doubled, and the number of chromosomes halved.
B. The number of chromosomes is halved, and the number of nuclei is doubled.
C. The number of chromatids is doubled, and the number of chromosomes doubles.
D. The number of nuclei is halved, and chromosomes is doubled.
7. What information can be obtained from this karyotype?
I. The individual is male
II. The individual has Down Syndrome
III. The individual is 22 years old
A. I, II and III
B. I only
C. I and II only
D. II and III only
8. During which phase of meiosis does the process of the reduction division occur?
A. Prophase I
B. Metaphase II
C. Anaphase I
D. Telophase II
9. Which of the following promotes genetic variation in meiosis?
I. Crossing over when bivalents form
II. Random orientation of homologous chromosomes
III. Fusion of gametes from different parents
A. I only
B. I and II only
C. II and III only
D. I, II and III
10. Non-disjunction refers to the chromosomes failing to separate correctly, resulting in gametes with one extra or one missing chromosome. When can this occur?
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