NEET Practice Questions (MCQs) with Answers & Solutions

In anaphase ll of meiosis centromeres divide and the spindle fibres pull the chromatids to opposite poles. Four groups of chromosomes are formed in the end of anaphase ll.

Richard Weinsberg (1972) reported the tubulin polymerisation by addition of $M{g}^{2+}$ and $C{a}^{2+}$. Microtubule could be disassembled and reassembled over and over by changing on concentration and lowering and raising the temperature.

Calcium Dependent Kinases (CDKs) have the ability to control cell cycle activities during cell division.

Anaphase II begins with the simultaneous splitting of the centromere of each chromosome (which was holding the sister chromatids together), allowing them to move toward opposite poles of the cell.

(page-169)

Meiosis involves pairing of homologous chromosomes and recombination between them. Meiosis I is initiated after the parental chromosomes have replicated to produce identical sister chromatids at the S phase.

(page-167)

During telophase, the chromosomes that have reached their respective poles decondense and lose their individuality. The individual chromosomes can no longer be seen and chromatin material tends to collect in a mass in the two poles.

(page-166)

Meiosis is called as reductional division. The DNA content of each daughter cell is reduced during meiosis because chromosomes do not replicate while cell divides.

(page-168,169)

During meiosis I, homologous chromosomes separate while during meiosis II, sister chromatids separate.

(page-168,169)

All of the above statements with respect to cytokinesis are true.

(page-166)

Crossing over is the exchange of genetic material between two homologous chromosomes. Crossing over is also an enzyme-mediated process and the enzyme involved is called recombinase.

(page-168)