Question

new cells are created from preexisting cells

Answer 1

An overview of the discovery of cell division, mitosis. For centuries people accepted the "spontaneous generation" of life from inanimate matter.

Answer 2

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For centuries people accepted the "spontaneous generation" of life from inanimate matter. When this long-standing myth was finally dispelled in the mid-1800s, it became clear that all life must arise from pre-existing life – via a process of reproduction. If cells are the fundamental units of life, they too must have a reproductive mechanism that maintains the proper chromosome number in each cell.

About a decade after the publication of Mendel's paper,scientists carefully documented the behavior of chromosomes during cell division (mitosis), using dyes to make them visible. First, each chromosome copies itself, and the duplicates line up at the "equator" of the cell. Then, duplicate copies of each chromosome are pulled toward opposite poles. Finally, the cell splits at the equator, producing two new cells with identical sets of chromosomes.

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