Question: 100% NCERT covered from Particular Keyword.Explanations are 100% from NCERT | [Difficult level: Easy] From NCERT NEET Derived Question.
The following events occur during the process of meiosis.
Arrange the following events of meiosis in the correct
sequence.
I. Terminalization
II. Crossing over
III. Synapsis
IV. Disjunction of genomes
(a) I, II, III, IV (b) II, III, IV, I
(c) III, II, I, IV (d) IV, I, II, III
Answer:
(c) The correct sequence of the events in the meiosis is:
III, II, I, IV
III. Synapsis: Synapsis is the pairing of two
homologous chromosomes that occurs during
meiosis. It allows matching-up of homologous
pairs prior to their segregation, and possible
chromosomal crossover between them. It
occurs in zygotene sage.
II. Crossing over: Crossing over is exchange of
chromosomes segments between non-sister
chromatids of homologous pair. Crossing over
occurs during pachytene stage.
I. Terminalization: Terminalization of chiasmata
occurs in diakinesis stage of meiosis I. It is the
disappearance of chiasmata of sliding towards
the tips of the chromosomes due to tight
condensation.
IV. Disjunction of genomes: The process of
breakdown of homologous chromosomes is
called disjunction. This process occurs in
anaphase I
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