Name ____________________________________________________________________ Per _________ Date _______________
MEIOSIS WORKSHEET
The following statements describe events in both meiosis I and meiosis II. Identify each phase, specifying whether it occurs during
meiosis I or II; for example, Prophase I or Prophase II.
Statement
Name of Phase
1. Homologous chromosomes line up at the equator
2. The cell replicates its chromosomes.
3. Centromeres break and sister chromatids pull apart.
4. The spindle forms, and the chromosomes coil, condense, and come
together in a tetrad; crossing over occurs.
5. Events occur in the reverse order from the events of prophase I. Each
new cell still contains double the amount of DNA.
6. Homologous chromosomes separate and move to opposite ends of the cell.
7. Nuclear envelope & nucleolus reform; cells contain ½ the amount of genetic
material as the original cell.
8. Sister chromatids line up on the metaphase plate.
9. Nuclear envelope disintegrates; spindle fibers elongate; DNA coils and
condenses; sister attach at their centromeres.
10. Describe the difference between anaphase of mitosis and anaphase I of meiosis. ______________________________________
__________________________________________________________________________________________________________
11. Explain why is meiosis referred to as “reduction division”? ________________________________________________________
__________________________________________________________________________________________________________
12. Which process would restore the diploid chromosome number after being halved in meiosis? _____________________________
13. Diploid is to somatic as haploid is to ______________________________.
14. The study of heredity is known as ___________________________________.
15. The passing of traits from parents to offspring is called ________________________________.
16. If the liver cells of an animal have 24 chromosomes, the sperm cells would have how many chromosomes? _________
17. ___________The exchange of segments of DNA between the members of a pair of chromosomes….
a. acts as a source of variation within a species
b. ensures that variations within a species never occur
c. occurs during metaphase I of meiosis
d. always produces genetic disorders
e. is called independent assortment
18. ___________Which of the following events DOES NOT occur in both prophase I of meiosis and prophase of mitosis?
a. the chromosomes condense in both
b. the nuclear envelope disassembles in both
c. a spindle forms in both
d. tetrads form in both
e. each chromosome has two chromatids in both
Examine the table. Then answer the questions.
Chromosome Numbers of Some Common Organisms
Organism
Body Cell Gamete
Human
46
23
Garden Pea
14
7
Fruit Fly
8
4
Tomato
24
12
Dog
78
39
Chimpanzee
48
24
Leopard frog
26
13
Corn
20
10
19. What is the diploid number of chromosomes in corn? _____________________
20. What is the haploid number of chromosomes in tomatoes? _____________________
21. How many pairs of chromosomes do humans have? _________________________
22. What process maintains a constant number of chromosomes within a species? ______________________
23. Centromere is to sister chromatid as ___________________________ is to homologous pairs.
Label the diagrams below. Use these choices: Metaphase I, Metaphase II, Interphase, Telophase I, Telophase II, Anaphase I,
Anaphase II, Prophase I, Prophase II.