AP BIOLOGY

CELL DIVISION

THE CELL CYCLE

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
When during the cell cycle are chromosomes visible?
A
Interphase
B
When they are being replicated
C
During cell division
D
During the G1 phase
Explanation: 

Detailed explanation-1: -Chromosomes become visible during prophase. Chromatin is in its least condensed stage during the interphase stage. It begins its condensation during the prophase stage and is visible until the end of cell division.

Detailed explanation-2: -Metaphase During metaphase, the nucleus dissolves and the cell’s chromosomes condense and move together, aligning in the center of the dividing cell. At this stage, the chromosomes are distinguishable when viewed through a microscope.

Detailed explanation-3: -Answer and Explanation: Chromosomes become visible during interphase, which involves the first three stages of the cell cycle such as the G1, S, and G2 phases.

Detailed explanation-4: -Chromosomes condense and become visible by light microscopy as eukaryotic cells enter mitosis or meiosis. During interphase (G1 + S + G2), chromosomes are fully or partially decondensed, in the form of chromatin, which consists of DNA wound around histone proteins (nucleosomes).

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