MITOSIS 1. The cell cycle Name and state the purpose of each of these sub phases P 1 : ……………………….. …………………………………………………………………………………………… Q : ……………………….. …………………………………………………………………………………………… P 2 : ……………………….. …………………………………………………………………………………………… R : ……………………….. …………………………………………………………………………………………… S : ……………………….. 1 P 1 P 2 Q R S
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MITOSIS
1.
The cell cycle
Name and state the purpose of each of these sub phases
P1 : ………………………..
……………………………………………………………………………………………
Q : ………………………..
……………………………………………………………………………………………
P2 : ………………………..
……………………………………………………………………………………………
R : ………………………..
……………………………………………………………………………………………
S : ………………………..
……………………………………………………………………………………………
2. State the definition of Mitosis.
1
P 1
P 2
Q
R S
3. Rearrange the jumbled words .
The importance of mitosis is :
a. W O T H G R _____________________
b. ELLC E C A L P N E T E R M _____________________
c. G E T O I R E N E N A _____________________
d. X E S A A U L D U T C I N E R R O P _____________________
4. Label the diagram below.
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MITOSIS Process by which a nucleus divides to produce _____________ daughter cells, each containing the __________ number of chromosomes as the parental cells.
i.
ii.
iii.
5. Underline the correct words in the bracket.
Cytokinesis in eukaryotes occurs ( just prior to , after ) mitosis; cell division in
prokaryotes occurs by a ( simpler, more complex ) process called, binary ( fission ,
fusion ). Between divisions, eukaryotic cells are in ( dormant-phase , interphase ) , an
active period during which chromosomal DNA is duplicated, the cell mass ( increases,
decreases) and new organelles are produced. Nuclear DNA is replicated only during S
phase. The process of mitosis occurs in the following order : prophase, ( anaphase ,
metaphase ) , ( anaphase , metaphase ) and telophase. The mitotic spindle is a
complex of ( microtubules , microfilaments ) that ( prevents , assists ) chromosome
movement. The spindle is attached to each chromosome at a site called the
( connector , centromere ). Following nuclear division, the cytosol of the cells is divided.
The soon-to-be daughter cells are separated by the cleavage ( plane , furrow ) in
animals cells and the cell ( plate , furrow ) in the plant cells.
6. How does mitosis in plant cells differ from mitosis in animal cells ?
Cell division in plant and animal cells differs in two ways : (1) animal cells have
have ………………………………….. , whereas plant cells have ………………………..
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8. Complete the flow chart below
Tissue Culture Technique
…………. of carrot
Transverse section of root
Cell ( …..n )
Fragments cultured in ……………..
Cell division ………………. to form …………
Callus cultured on ……….. medium and transferred to ………….
Adult plant
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9. Explain briefly how Dolly the sheep was produced by cloning. Give your answer in the
form of a diagram which shows the successive steps with explanatory notes for each
step.
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10. ADVANTAGES AND DISADVANTAGES OF CLONING
Advantage Disadvantage
Cloned plant are ……………………… is
size and shape
Clones are …………………… to new
diseases
Plants can be produced ………… the year Clones are easily destroyed if there is a
…………………. in the environment
Plant maintain the …………….. designed
characteristics of the mother plants
Tissue culture techniques are cost
……………………
Clones can be produced in ………………..
numbers in a short time
MEIOSIS
11.
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MEIOSIS Process by which a nucleus divides to produce ____________ daughter cells, each containing ___________ the number of chromosomes of the parental cell.
12. Fill in the blank using the words provided.
1. At __________ phase of meiosis are these two cells, each with sister chromatids
aligned at the spindle equator.
2. The meiotic process by which homologues are paired during prophase I is called
__________ .
3. Crossing occurs during ________ .
4. Meiosis consists of __________ nuclear divisions, producing ___________
haploid cells.
5. The function of meiosis I is to separate _________ . The function of meiosis II is
to separate _____________ .
6. Meiosis I produces two ____________ cells.
7. Meiosis II produces four ______________ cells.
13. By using two different colours show the result of crossing-over.
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Synapsis Sister Chromatids Metaphase II four
Haploid Haploid Homologous chromosomes
Two Diploid Prophase I Diploid
14. Complete the table below.
Name of Phase Description
1. Homologous chromosomes pair up and form tetrad
2.Spindle fibers move homologous chromosomes to opposite