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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.
Fill the blank
Q1. What is the difference between chromatin fibre and chromosome ?
(a) How many strands are there in the diagram?
(b) How many nucleotides have been shown in each strand?
(c) Name the DNA unit constituted by the parts 1,2 and 3 collectively
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.
Difference between Cytokinesis and karyokinesis.
*No irrelevant answers pls*
Please answer 1 st one.
*No irrelevant answers*
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................