What happens during s phase?
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a. chromosomes are duplicated.
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b. the cell splits in two.
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c. dna separates into two nuclei.
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d. cytoplasm is manufactured.

The mitotic phase follows interphase. Mitosis is nuclear division during which duplicated chromosomes are segregated and distributed into daughter nuclei. Usually the cell will divide after mitosis in a process called cytokinesis in which the cytoplasm is divided and two daughter cells are formed.

Explanation:

"do a testcross with a homozygous recessive plant."