MY CART (5)

Use Coupon: CART20 and get 20% off on all online Study Material

ITEM
DETAILS
MRP
DISCOUNT
FINAL PRICE
Total Price: Rs.

There are no items in this cart.
Continue Shopping
Menu
Grade: 12th pass
        In the chapter `Cell cycle and cell division` in NCERT, it is given that during S phase, the DNA per cell doubles but chromosome number remains the same. How is this possible? Are they both related? Why the increase in DNA doesn`t change chromosome eventhough DNA is a part of chromosome??!!
5 months ago

Answers : (1)

Simran Vinaik
askIITians Faculty
905 Points
							
During S phase, which follows G1phase, all of the chromosomes are replicated. Earlier they had single chromatid. Following replication, each chromosome now consists of two sisterchromatids. Thus, the amount of DNA in the cell doubles, even though the chromosome count, of the cell remains at 2n
Note: DNA content from 2c becomes 4c after replication but the number of centromeres and chromosomes remains unchanged. In picture left and right both will be considered as a single chromosome.
Remember during Anaphase only when the centromere will break and the sister chromatids will separate at that time each chromatid will be considered as a chromosome.554-2336_chroosome.png554-564_Karyotypes+Before+and+After+S-phase+of+Cell+Cycle.jpg
5 months ago
Think You Can Provide A Better Answer ?
Answer & Earn Cool Goodies

Get Extra Rs. 3,180 off

COUPON CODE: SELF20


Course Features

  • 728 Video Lectures
  • Revision Notes
  • Previous Year Papers
  • Mind Map
  • Study Planner
  • NCERT Solutions
  • Discussion Forum
  • Test paper with Video Solution


Course Features

  • 46 Video Lectures
  • Revision Notes
  • Test paper with Video Solution
  • Mind Map
  • Study Planner
  • NCERT Solutions
  • Discussion Forum
  • Previous Year Exam Questions


Get Extra Rs. 159 off

COUPON CODE: SELF20

Ask Experts

Have any Question? Ask Experts

Post Question

 
 
Answer ‘n’ Earn
Attractive Gift
Vouchers
To Win!!! Click Here for details