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If a researcher looks at a cell and notices a straight line of sister chromatids. They  are viewing metaphase.

What is metaphase?

The chromosomes are at their second-most compacted and coiled state during the mitotic stage of the eukaryotic cell cycle, known as metaphase. These chromosomes, which contain genetic material, align in the cell's equator before being divided into the two daughter cells.

A phase of cell division known as "metaphase" (mitosis or meiosis). Individual chromosomes are typically dispersed throughout the cell nucleus. The chromosomes of the cell condense and move toward one another, aligning in the center of the dividing cell, and the nucleus of the cell disintegrates during metaphase.

The alignment of paired chromosomes along a cell's metaphase plate is known as the first metaphase of meisosis I.

To learn more about metaphase from the given link:

brainly.com/question/16992029

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