MICROVIEWER ANIMAL MITOSIS
First cleavage in Ascaris
1. All life forms begin as a single?
2. What type of animal is Ascaris?
3. How many chromosomes does Ascaris have?
4. In the slides you will view, the “equatorial plate” runs from ___________________ to
________________; whereas the poles are from the ___________________ to the ________________ of the
plate.
SLIDE 1- The Zygote
5. A zygote is a?
6. Why does the zygote appear to have two masses of chromatin?
7. The female egg supplies more chromatin than the male’s sperm. True or False?
8. Sketch the zygote and label zygote and chromatin.
SLIDE 2- Pro-metaphase
9. Each parent supplied two _________________________________ to form the zygote.
10. Describe the shapes of each pair of chromosomes: _______________________________________and
____________________________________.
11. After fertilization, the chromosomes pair up and move towards the
___________________________________.
SLIDE 3- Metaphase
12. Sketch the zygote at this stage and label chromosomes, centriole, aster, and spindle fibers. Draw a dashed line
and label it equatorial plate.
SLIDE 4- Metaphase-Polar View
13. Why can you now see the chromosomes as clearly separate units?
SLIDE 5- Early Anaphase
14. Can you clearly see all duplicated chromosomes in the slide?
15. Altogether, how many chromosomes are present in the cell?
SLIDE 6- Anaphase
16. Sketch the cell and label chromosomes and aster and draw a dashed line labeled equatorial plate.
17. Why do some of the chromosomes look beaded?
SLIDE 7- Telophase
18. What obvious differences in cell structure are present in this view?
SLIDE 8- Late Telophase
19. The original zygote has now divided into two?
20. These two cells will soon become ____________ cells, each with __________ pairs of chromosomes.
21. In 1958 it was discovered that humans have _______ chromosomes (__________ matching pairs).