This document describes the process of mitosis in Ascaris, a roundworm commonly used in biology studies. It discusses each stage of mitosis - prophase, metaphase, anaphase and telophase - and provides details about the location and structure of chromosomes during each stage. Key points include that Ascaris has 4 chromosomes, the chromosomes condense and pair up during prophase, align at the equatorial plate in metaphase, separate into two groups in anaphase, and decondense in telophase as the cell divides into two daughter cells each with 4 chromosomes.

1. Names ___________________________ Date ___________
___________________________
Ascaris Mitosis (Slide Viewer #53)
Introduction
1. Life begins as a single ___________.
2. What is Ascaris?
3. Why is Ascaris a good subject for the study of chromosomes?
4. How many chromosomes does Ascaris have?
5. Where is the equatorial plate located?
6. What does 750x mean?
The Zygote
7. Define zygote.
8. The chromatin contributed from the sperm and egg are ________ in amount.
9. The chromosomes are NOT seen distinctly because they are very ________.
10. Draw the zygote below. LABEL the two masses of chromatin, the cytoplasm and the cell membrane.
Zygote: Slide 1

2. Prophase
11. The ____________________ have become much shorter and thicker.
12. How many chromosomes do you see? _______
13. After fertilization, the _______________ chromosomes and the _______________
chromosomes pair up.
14. Draw prophase. Label the U-shaped and bent chromosomes (Prophase: Slide 2)
Metaphase
15. In this slide the chromosomes have moved to the__________________ plate
16. At each pole is a _________________
17. A starlike structure called an ___________________, radiates from each _________________.
18. Fine _____________ ________________ go from centriole to each chromosome.
19. Chromosomes are held together by a structure called a ________________________.
20. Draw Metaphase. Label: aster, spindle fibers, and chromosomes ( Metaphase: Slide 3)

3. Metaphase--Polar View
21. In slide #4, you are looking at the same stage as shown in slide #3, but we are now looking at the cell from
the ____________.
22. The four chromosomes are seen as they lie flat on the ___________________ _____________.
Early Anaphase
23. How many U's are there in this stage? _________ How many bents? __________
24. In these eight chromosomes, there is enough hereditary material for two__________.
25. The groups are starting to move toward the ____________
26. Each chromosome is being pulled by a ____________________, attached to each _______________
27. Draw early anaphase. Label: centriole, aster, chromosomes, cell membrane (Early anaphase: Slide 5)
Anaphase
28. The eight chromosomes are now ___________________ into two groups.
29. Electron microscopes show that spindle fibers are made of structures called _____________________
30. Why causes the chromosomes to look beaded?
31. Draw anaphase.
Anaphase: Slide 6

4. Telophase
32. The chromosomes have moved completely ________________________
33. The cell membrane ________________ inward and the cytoplasm is dividing into two masses
34. As the cell approaches its division into two cells, the chromosomes become less ________________
35. Draw Telophase. (Telephase: Slide 7)
Late Telophase and Cytokinesis
36. The separation is now _________________
37. Each of these two cells has __________ chromosomes
38. One cell with _______ pairs of chromosomes formed _________ cells.
39. How many chromosomes does a human cell have? _________________
40. Comparasion of Plant and Animal cell Telophase:
Use the slides on plant Mitosis and go to the last slide.
Draw late telophase in the animal cell from the ascaris mitosis and late telophase in the plant cell. Name and
describe at least three major differences between the two.