ÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝ Name ___________________________
Ascaris MitosisÝ (Slide Viewer #53)
1.Ý Life begins as a singleÝ ___________.
2.Ý What is Ascaris?
3.Ý Why is Ascaris a good subject for the study of chromosomes?
4.Ý How many chromosomes does Ascaris have?
5.Ý Where is the equatorial plate located?
6.Ý What does 750x mean?
7.Ý Define zygote.
8.Ý The chromatin contributed from the sperm and egg are ________ in amount.
9.Ý The chromosomes are NOT seen distinctly because they are veryÝ ________.
10.Ý Draw the zygote below.Ý LABEL the two masses of chromatin, the cytoplasm and the cell membrane.
ÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝ Zygote:Ý Slide 1
11.Ý TheÝ ____________________ have become much shorter and thicker.
12.Ý How many chromosomes do you see?ÝÝÝ _______
13.Ý After fertilization, the twoÝ _______________Ý chromosomes and the twoÝ _______________Ý
ÝÝÝÝÝÝ chromosomes pair up.
14.Ý Draw prophase.Ý Label the U-shaped and bent chromosomes (Prophase:Ý Slide 2)
15.Ý In this slide the chromosomes have moved to theÝ __________________ plate
16.Ý At each pole is aÝ _________________
17.Ý A starlike structure calledÝ an ___________________, radiates from eachÝ _________________.
18.Ý FineÝ _____________ÝÝ ________________Ý go from centriole to each chromosome.
19.Ý Chromosomes are held together by a structure called aÝ ________________________.
20.Ý Draw Metaphase. ÝLabel:Ý aster, spindle fibers, and chromosomes ( Metaphase:Ý Slide 3)
21.Ý 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.Ý The four chromosomes are seen as they lie flat on the ___________________ÝÝ _____________.
23.Ý How many U's are there in this stage?Ý _________ÝÝÝ How many bents?Ý __________
24.Ý In these eight chromosomes, there is enough hereditary material for twoÝ __________.
25.Ý The groups are starting to move toward the ____________
26.Ý Each chromosome is being pulled by a ____________________, attached to each _______________
27.Ý Draw early anaphase.Ý Label:Ý centriole, aster, chromosomes, cell membrane (Early anaphase:Ý Slide 5)
28.Ý The eight chromosomes are now ___________________ into two groups.
29.Ý Electron microscopes show that spindle fibers are made of structures calledÝ _____________________
30.Ý Why causes the chromosomes to look beaded?
31.Ý Draw anaphase.ÝÝ
ÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝÝ Anaphase:Ý Slide 6
Telophase
32.Ý The chromosomes have moved completelyÝ ________________________
33.Ý The cell membrane ________________Ý inward and the cytoplasm is dividing into two masses
34.Ý As the cell approaches its division into two cells, the chromosomes become lessÝ ________________
35.ÝÝ Draw Telophase. (Telephase:Ý Slide 7)
36.Ý The separation is nowÝ _________________
37.Ý Each of these two cells hasÝ __________Ý chromosomes
38.Ý One cell with _______ pairs of chromosomes formed _________ cells.
39.Ý How many chromosomes does a human cell have?Ý _________________
40.Ý Draw late telophase. (Late Telopase and Cytokinesis:Ý Slide 8)