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NEL Cell Division 581

Section17. 3

Section 17.3 Questions

1. How does the first meiotic division differ from the second
   meiotic division?
   2.Explain why synapsis may lead to the exchange of genetic
   information.
   3.Construct a table to compare meiosis with mitosis. How
   does meiosis differ from mitosis?
   4.A muscle cell of a mouse contains 22 chromosomes. Based
   on this information, how many chromosomes are there in
   the following types of mouse cells?
   (a) daughter muscle cell formed from mitosis
   (b) egg cell
   (c) fertilized egg cell
   5.Compare the mechanisms of gametogenesis in males and
   females.
   6.When meiosis occurs in females, the cytoplasm is not
   divided equally among the resulting four cells. Explain why.


2. Compare the life cycles of plants and animals.
   8.Figure 12shows sperm cell production following meiosis.
   (a) Which cells do not contain homologous pairs?
   (b) If the chromosome number for cell A is 12, indicate the
   chromosome number for cell C.

9.Use Figure 13to answer the questions below.

(a) Which process(es) identify mitosis? Explain your

answer.

(b) Which process(es) identify meiosis? Explain your

answer.

parent 1 parent 2

process W process X

1 n

process Y

process Z

embryo

(^22) nn 22 nn
11 nn
22 nn
Figure 13
The processes and number of sets of chromosomes involved
in the production of an embryo in humans
AA
BB BB
CC CC CC CC
Figure 12
Sperm cell production in humans
10.King Henry VIII of England had some of his wives executed
for not producing sons. Indicate why a little knowledge of
meiosis might have been important for Henry’s wives.

11. A microscopic water animal called Daphniacan be
    reproduced from an unfertilized egg. This form of
    reproduction is asexual because male gametes are not
    required. Indicate the sex of the offspring produced.
    Explain your answer.