NEET BIOLOGY

Detailed explanation-1: -Prior to every single mitotic division, a cell undergoes, the DNA in the parent cell replicate themselves. The homologous chromosomes within the cell will not pair up and undergo genetic recombination with each other.

Detailed explanation-2: -Nondisjunction means that a pair of homologous chromosomes has failed to separate or segregate at anaphase so that both chromosomes of the pair pass to the same daughter cell. This probably occurs most commonly in meiosis, but it may occur in mitosis to produce a mosaic individual.

Detailed explanation-3: -During mitosis we do not see separation of the homologous chromosomes. This is the reason that meiosis results in a reduction of ploidy and that mitosis does not. Separation of homologous chromosomes occurs after the formation of tetrads, during anaphase I of meiosis.

Detailed explanation-4: -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-5: -Final answer: During Anaphase I of meotic phase homologous chromosomes separate while the sister chromatids remain associated at their centromeres.