BI 101 Unit 4 Quiz

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Animal mitotic cell division is initiated by the division of the _______.
centriole
centomer
e
nucleus
mitotic
spindle
Crossing over is one of the most important events in meiosis because

2. it produces arrays of alleles in chromosomes.
homologous chromosomes must be separated into different
daughter cells.
the number of chomosomes allotted to each daughter cell must be
halved.
homologous chromatids must be separated into different daughter
cells.
all of
these.
The purpose of mitosis is to ___, while the purpose of meiosis is to ____.

3. make new cells, and only germ-line cells do it; make eggs or sperm, and all the
body cells do it
make eggs or sperm, and only germ-line cells do it; make new cells, and all body
cells do it
make eggs or sperm, and only somatic cells do it; make new cells, and all body
cells do it
make new cells, and all body cells do it; make eggs or sperm, and only germ-line
cells do it
The chromosomes have arrived at opposite poles during
anaphas
e

4. interphas
e
metaphas
e
prophase
telophas
e
While viewing stained onion root tip cells you notice that distinct chromosomes cannot be
observed in most of the cells. This is because most of the cells
were destroyed while preparing the
slide.

5. must be in interphase.
are in metaphase.
must be undergoing
meiosis.
Which of the following is the longest stage of mitosis?
prophase
metaphas
e

6. anaphas
e
telophas
e
During which stage of mitosis do chromatids separate to form two sets of daughter
chromosomes?
prophas
e
telophas
e
anaphas
e

7. interphas
e
Chromatids that are attached at the centromere are called what kind of chromatids?
mother
daught
er
sister
programme
d
Four of the five answers below are related by a common phase of mitosis. Select the
exception.

8. chromosomes align at the spindle equator
sister chromatids become individual
chromosomes
centromeres divide
the chromosomes move
apart
spindle microtubules shorten, pulling chromosimes toward
the poles