In what phase of meiosis does the following occur?Chromosomes are pulled by spindle fibers to the mid-line of the cell. Each chromosome is paired with its homologue.

CELL DIVISION AND CANCEROUS CELLS

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

A	Prophase I
B	Anaphase I
C	Metaphase I
D	Telophase I
E	Prophase II

Explanation:

Detailed explanation-1: -After the pairs of chromosomes are aligned, anaphase I begins. During this stage, the microtubules, or spindle fibers, pull the homologous chromosomes apart and move them to opposite ends of the cell.

Detailed explanation-2: -Anaphase I: In anaphase I, the attachment of the spindle fibers is complete. The homologous chromosomes are pulled apart and move towards opposite ends of the cell.

Detailed explanation-3: -During prophase I, the pairs of homologous chromosomes come together to form a tetrad or bivalent, which contains four chromatids. Recombination can occur between any two chromatids within this tetrad structure.

Detailed explanation-4: -Metaphase I: Spindle fibers attach to the paired homologous chromosomes. The paired chromosomes line up along the equator (middle) of the cell. This occurs only in metaphase I. In metaphase of mitosis and meiosis II, it is sister chromatids that line up along the equator of the cell.

Detailed explanation-5: -Prophase I: The homologous chromosomes line up together. During this time, a process that only happens in meiosis can occur. This process is called crossing over (Figure below), which is the exchange of DNA between homologous chromosomes. Crossing over forms new combinations of alleles on the resulting chromosome.

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