Download united we stand, divided we grow

DIVIDED WE GROW – MITOTIC CYCLE
OBJECTIVE
After completing this activity, you will be able to describe the components of the mitotic cell
cycle and explain how mitosis is important to multicellular organisms.
DIRECTIONS
Use your textbook or other resource(s) suggested by your teacher to answer the following
questions.
1) What two things must parent cells provide their daughter cells in order for them to
survive? Why do daughter cells need these things?
2) What are the two purposes of mitosis in multicellular organisms? What kinds of cells
does mitosis produce?
3) What is a chromosome? Before mitosis, what happens to a parent cell’s chromosomes?
Why is this important?
4) Draw a doubled chromosome. Label the sister chromatids and the centromere. What is
the function of the centromere?
5) How many chromosomes are present in human somatic cells? How many pairs of
chromosomes are present in human somatic cells? Why are the chromosomes of sexually
reproducing organisms arranged in pairs? What does diploid mean?
6) In terms of chromosome number, a parent cell before mitosis has the ____________
number and produces two _____________ daughter cells after mitosis is complete.
Therefore the number of chromosomes remains _______________ from one generation
to the next.
7) Identify the components of the cell cycle as illustrated in the diagram below.
a
a)
b)
c)
c
d
d)
e)
f)
b
g)
i
h
g
f
e
h)
i)
8) What are the major events that occur in the G1, S, and G2 phases of interphase? On
average, interphase accounts for what percent of the cell cycle?
9) What cell division step is described in your textbook but absent from the diagram above?
What is the purpose of this step?
10) Define the following terms and explain how each is related to cell division.
a) growth factor
b) density-dependent inhibition
c) anchorage dependence