Meiosis Diagram Labeling

Questions and Answers

What is Interphase?

Working stage of the cell; G1, S, G2 (correct)

Stage where chromosomes condense

Stage where cell divides

None of the above

What occurs during Prophase I?

The pairing of homologous chromosomes to form tetrads, crossing over occurs, nuclear envelope breaks down, spindle fibers form.

What happens in Metaphase I?

Homologous pairs of chromosomes or tetrads line up along the middle of the cell.

What is the main event during Anaphase I?

Homologous chromosomes or tetrads separate to opposite poles, retaining sister chromatids together. Signup and view all the answers

What occurs in Telophase I?

Each pole now has a haploid set of chromosomes; cytokinesis occurs and two haploid daughter cells are formed. Signup and view all the answers

What takes place during Prophase II?

Chromatin condenses into chromosomes, spindle fibers form; does NOT involve any pairing of homologous chromosomes. Signup and view all the answers

Describe what happens in Metaphase II.

Duplicated chromosomes individually line up in the middle of the cell. Signup and view all the answers

What occurs during Anaphase II?

Chromatids of a chromosome separate to opposite poles, splitting the centromere. Signup and view all the answers

What is the outcome of Telophase II?

The homologous chromosome pair reaches the poles of each cell; a furrow forms in the middle resulting in the formation of four daughter cells. Signup and view all the answers

What happens in the 1st Cell Division?

2 haploid daughter cells are formed. Signup and view all the answers

Study Notes

Meiosis Overview

Meiosis is a two-stage process of cell division that results in four haploid daughter cells from one diploid parent cell.
Key stages include Meiosis I and Meiosis II, each with distinct phases.

Interphase

Working stage of the cell, consisting of three phases: G1, S, and G2.
During interphase, the cell prepares for division, grows, and duplicates its DNA.

Prophase I

Homologous chromosomes pair up to form tetrads, allowing genetic recombination through crossing over.
The nuclear envelope disintegrates, and spindle fibers begin to form.

Metaphase I

Tetrads align along the equatorial plane of the cell, facilitating the random assortment of chromosomes.

Anaphase I

Spindle fibers pull homologous chromosome pairs (tetrads) to opposite poles.
Sister chromatids remain attached at their centromeres throughout this phase.

Telophase I

Each pole of the cell has a haploid set of chromosomes, each still composed of two sister chromatids.
Cytokinesis occurs, resulting in the formation of two haploid daughter cells.

Prophase II

Chromatin condenses back into visible chromosomes, and spindle fibers develop without homologous pairing.
This stage prepares the cells for the second meiotic division.

Metaphase II

Duplicated chromosomes line up individually along the cell's equator, allowing for separation of sister chromatids.

Anaphase II

The spindle fibers attach to the centromeres of duplicated chromosomes, pulling the sister chromatids apart toward opposite poles.

Telophase II

Homologous chromosome pairs reach opposite poles, and a cleavage furrow begins to form.
Results in a total of four haploid daughter cells, each genetically distinct from the parent cell.