Tetrad is the term for the two sets of chromatids formed in the parent cell. Thus, the correct option is D.
Chromatids are refers to as which allow cells to store two copies of their information in preparation for cell division. This is important to establish that daughter cells are healthy and fully functional and carrying a full complement of the parent cells DNA.
Chromatid permits cells to store two copies of their information in formation for cell division.
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