Cell Division Exercise1. The genetic component of our skin cell
is the same as the geneticcomponent of ___________________. I. the
zygoteII. The eggIII. The spermIV. The red blood cell
2. Mitosis is important in all the following processes except
___________.I. Elongation of the shoot apexII. Elongation of the
rootsIII. Increase in diameter of the plantIV. Formation of the
ovule
3. The following are all examples of regeneration exceptI. The
yeast forming new cellsII. The lizard growing a new tailIII. The
star fish forming a new armIV. The planaria growing a new part of
its body
4. Give two reasons why mitotic cell division is important in
living organism.
i.
____________________________________________________________
ii.
____________________________________________________________
5. Describe the process that takes place during the S phase.
__________________________________________________________________
__________________________________________________________________6.
What is cytokinesis?
_____________________________________________________________________
_____________________________________________________________________
7. How does a normal cell change into a cancerous cell?
_____________________________________________________________________
_____________________________________________________________________
8. State two differences between meiosis I and meiosis II.
i.
_______________________________________________________________
ii.
_______________________________________________________________
Answer
Give two reason why mitotic cell division is important in living
organismDistributing an exact copy of each of their chromosomes to
the new cellsFor normal growth, development and maintenance
Describe the process that takes place during the S
phase.Synthesis of DNA occurs during the S phase. The DNA in the
nucleus undergoes replication. Each duplicated chromosome now
consists of the two identical sister chromatids which contain
identical copies of chromosomes DNA molecule
3.What is cytokinesis?Cytokinesis is the division of the
cytoplasm, occurs towards the end of telophase.
4.How does a normal cell change into a cancerous cell?When a
cell divides through mitosis repeatedly, without control and
regulation, it produce cancerous cells1. State two differences
between meiosis I and meiosis II. Meiosis 1Meiosis 11
During prophase I, homologous chromosomes pair up and crossing
over between non-sister chromatids occurs.During prophase II,
synapsis of homologous chromosomes and crossing over between
non-sister chromatids does not take place
During metaphase I, homologous chromosomes align at the
metaphase plate (equator) of the cellDuring metaphase II,
chromosomes align at the metaphase plate (equator) of the cell.
During anaphase I, homologous chromosomes separate and move to
opposite poles. Sister chromtids are still attached together and
move as a unit.During anaphase II, sister chromatids separate,
becoming daughter chromosomes that move to the opposite poles.
At the end of telophase I, two haploid daughter cells are
formed. Each daughter cell has only one of each type of
chromosomes; either the paternal or the maternal chromosomeAt the
end of telophase II, four haploid daughter cells are formed. Each
daughter cell has the same number of chromosomes as the haploid
cell produced in meiosis I, but each cell has only one of the
sister chromatids.
