The list below describes some of the events associated with normal cell division. 1. Nuclear membrane formation around each set of newly formed chromosomes 2. Centrioles move to poles and nuclear envelope disappears 3. Replication of each chromosome 4. Movement of single stranded chromosomes to opposite ends of the spindle. What is the normal sequence in which these events occur?

MITOSIS AND MEIOSIS

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Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]

A	3-4-2-1
B	1-2-3-4
C	3-2-4-1
D	4-3-1-2

Explanation:

Detailed explanation-1: -The cell cycle is a four-stage process in which the cell increases in size (gap 1, or G1, stage), copies its DNA (synthesis, or S, stage), prepares to divide (gap 2, or G2, stage), and divides (mitosis, or M, stage).

Detailed explanation-2: -Prophase – The chromosomes shorten and thicken. Metaphase – Chromosomes line up in the middle of the cell. Anaphase – Chromatids break apart at the centromere and move to opposite poles. Telophase – Two nuclei formed after nuclear envelopes reform around each group of chromosomes.

Detailed explanation-3: -Prophase is the first stage in mitosis, occurring after the conclusion of the G2 portion of interphase. During prophase, the parent cell chromosomes-which were duplicated during S phase-condense and become thousands of times more compact than they were during interphase.

Detailed explanation-4: -Thus, the correct answer is ‘Prophase.

There is 1 question to complete.

AP BIOLOGY

LABORATORY REVIEW

MITOSIS AND MEIOSIS