Q1 of 33 Page 18

State the difference between

Chromosome and chromatid,















Chromosome



Chromatid



1) A chromosome is a single form of DNA and protein that found in the nucleus.



1) A chromatid is a sister or an exact replica of a chromosome that is formed during the cell division.



2) A chromosome is a vector of heredity.



2) Chromatid enables these cells to replicate.




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2

Match the events given in column A with the phase in mitotic cell division in Column B























Column 'A'



Column 'B'



(a) Chromosomes get arranged in a horizontal the plane at the equator.



Anaphase



(b) Daughter chromosomes move to the opposite poles of a spindle.



Prophase



(c) Chromosomes become visible as fine long threads.



Telophase



(d) Chromosomes lose their distinctiveness and gradually become transformed into a chromatin network.



Metaphase


 3

Fill in the blanks

(a) Mitosis occurs in our .................... cells.


(b) Mitosis produces two daughter cells whereas meiosis produces ....................daughter cells.


(c) Meiosis occurs only in .................... cells.


(d) Modern humans have 46 chromosomes. Their sperms and eggs will have ................... chromosomes each.


(e) During the pairing of chromosomes in meiosis, the.................... chromosomes come to lie side by side.


(f) The ................ (s) are surrounded by radiating rays and termed as aster.

 1

State the difference between

Centrosome and centromere,

 1

State the difference between

Aster and spindle fibers.