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Syllabus
4. 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 t lie side by side.
(f) The ..................(s) are ssurrounded by radiating rays and termed as aster.
Q1. What is the difference between chromatin fibre and chromosome ?
1. Differentiate between Karyokinesis and Cytokinesis.
2. Answer th following
(a) How many consecutive division will take place in producing 16 daughter cells from 1 cell by mitosis cell division.
(c) Wha is the unit term of DNA helix?
Why are the two strands of DNA are held together in double helix?
Give reasons :
1. Meiosis is known as reduction division.
2. There is no aster formation in plant cells.
3. Formation of proteins before mitotic division is essential.
4. Meiosis helps in evolution.
Q1. With the help of a diagram, write about different types of chromosomes based on the position of centromere.
PROGRESS CHECK
1. Fill in the blanks:
(i) Chromatin fibre is made up of DNA and...................................................
(ii) The chromatids are attached to each other at.........................................
(iii) DNA replicates in the.............................................of the cell cycle.
(iv) Who first discovered the structure of DNA?...........................................................................
b. How many cells will be produced from 1 cell which divides consecutive meiosis division.
Answer the following
d. Name three components of nucleotide.
1. Chromatic fibre is made up of DNA and....................
2.The chromatids are attached to each other at..................
3.The structure of DNA was first discovered by................