Summary Illustrated guide on chromosome structure and cell cycle(mitosis, meiosis)
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Course
Biology
Institution
(i) Cell Cycle and Cell Division:
Cell Cycle – Interphase (G1, S, G2) and Mitotic Phase
Cell Division:
Mitosis and its stages.
A basic understanding of Meiosis as a reduction division (stages not required).
A brief idea of homologous chromosomes and crossing over leading to variations....
organised called into separate units chromosomes
Chromosomes
T
[ highly condensed
• are
Only condenses during -7 coiled chromatin fibres
cell division * Contains 2 sister chromatids joined
atthecentomere
•
Sister chromatids
auduphialicopiesof
Chromatin eaehotherconlymitosisastheyduphiate themselves
DNA coiled up with histories so-lhewofcheomosomesremainsameofhrdius.vn
DNA -40%
called
Histones -60% •
sistucheomatidsldaugtncdbasthy
have lheabihtgtoeepeodxe
-
Structure of DNA
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Studiedby Rosalind feanklinlwokedoutbywatsonlaick.in19531
Watson & Giekwonanokdpeizefoilhisin 19621 ?
Mondale Nitrogen bases
Each th
DNAsliandconsisb-ofeepeat.mg nucleotides
sugar c)
G
Guanine (G) Triple hydrogen bond
ctdeninelctljgiplehychogenbond
Thymine
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