NEET PG DENTAL EXAM

EMBRYOLOGY

CHROMOSOMES AND CELL DIVISIONS

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Why is it necessary for the DNA to replicate prior to cell division?
A
so each daughter cell will have 23 chromosomes
B
so each daughter cell will have a complete copy of the genetic material
C
so each daughter cell will have 46 homologous chromosomes
D
so each daughter cell will have 2 sister chromatides
Explanation: 

Detailed explanation-1: -Cells must replicate their DNA before they can divide. This ensures that each daughter cell gets a copy of the genome, and therefore, successful inheritance of genetic traits. DNA replication is an essential process and the basic mechanism is conserved in all organisms.

Detailed explanation-2: -The S phase of a cell cycle occurs during interphase, before mitosis or meiosis, and is responsible for the synthesis or replication of DNA. In this way, the genetic material of a cell is doubled before it enters mitosis or meiosis, allowing there to be enough DNA to be split into daughter cells.

Detailed explanation-3: -DNA duplication during S phase of the cell cycle allows cells to maintain their genetic content across generations. The primary function of sister chromatids is to pass on a complete set of chromosomes to all the daughter cells formed as a result of cell division.

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