Practice free Botany NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
During meiosis I in human, one of the daughter cells receives:
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)
Chromosomes decondense into diffuse chromatin:
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)
The total DNA content of each daughter cell is reduced during meiosis because:
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)
Which of the following is not true for sister chromatids?
During meiosis I, homologous chromosomes separate while during meiosis II, sister chromatids separate.
(page-168,169)
Which of the following statements is True?
All of the above statements with respect to cytokinesis are true.
(page-166)
Crossing is an enzyme-mediated process. The enzyme is:
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)
Which event is not associated with prophase I?
Segregation occurs in Anaphase.
Synizesis refers to a phenomenon sometimes observed in one of the subphases of meiosis. In this, the contraction of chromatin towards one side of the nucleus during the prophase of meiosis occurs. In certain plants like Lilium, the chromosomes are densely clumped to one side, no chromatin material being seen in the rest of the nucleus. This phenomenon is called synizesis and its significance is not clearly understood. It occurs during Leptotene.
(page-169)
A cell cycle includes:
A cell cycle includes:-
M phase: It represents the phase when the actual cell division or mitosis occurs.
Interphase: It represents the phase between two successive M phases.
(page-163)
Interphase:
The interphase, though called the resting phase, is the time during which the cell is preparing for division by undergoing both cell growth and DNA replication in an orderly manner. The interphase is divided into three further phases: G1, S and G2 phase.
(page- 163)
The sequence of events by which a cell duplicates its genome, synthesises other constituents of cells and eventually divides into daughter cells is termed as:
The sequence of events by which a cell duplicates its genome, synthesises the other constituents of the cell and eventually divides into two daughter cells is termed cell cycle.
(page-162)
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