name the stage of the cycle at which following events occur-
a. paring of homologous chromosomes
b. replication of DNA
c. sepration of homologous chromosomes
d. dissolution of synaptomental complex
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Answers
b) Metaphase
c) Anaphase
d) Telophase
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A. The pairing of homologous chromosomes is called synapsis. This occurs during the second stage of prophase I or zygotene.
B. Interphase is divided into three phases. G1 phase – It is the stage during which the cell grows and prepares its DNA for replication. In this phase, the cell is metabolically active. S phase – It is the stage during which DNA synthesis occurs.
C.The interphase is divided into three phases, which are as follows:
G1 phase (Gap 1): During this phase, the cell is metabolically active and continuously grows.
S phase (Synthesis): During this phase, DNA synthesis or replication takes place.
G2 phase (Gap 2): During this phase, protein synthesis takes place.
D. Electron micrographs of this stage indicate that chromosome synapsis is accompanied by the formation of complex structure called synaptonemal complex. The complex formed by a pair of synapsed homologous chromosomes is called a bivalent or a tetrad. However, these are more clearly visible at the next stage.