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Crossing over that results in genetic recombination in higher organisms occurs between:
The process of appearance of recombination nodules occurs at which sub stage of prophase I in meiosis?
Spindle fibres attach on to?
In meiosis, crossing over and exchange of genetic material between homologous chromosomes are catalyzed by the enzyme:
Dissolution of the synaptonemal complex occurs during :
During Meiosis 1, in which stage synapsis takes place?
During cell growth, DNA synthesis takes place in:
In the 'S' phase of the cell cycle:
Attachment of spindle fibers to kinetochores of chromosomes becomes evident in:
The oocytes of some vertebrates get arrested for years or months in:
In a mitotic cycle, the correct sequence of phases is
Which one of the following never occurs during mitotic cell division?
Identify the correct statement with regard to G1 phase (Gap 1):
Select the correct sequence of events occurring during Prophase-I of Meiosis-I: (a) Synapsis of homologous chromosomes (b) Crossing over between non-sister chromatids (c) Condensation of chromatin (d) Dissolution of the synaptonemal complex (e) Terminalisation of chiasmata
Among eukaryotes, replication of DNA takes place in:
Archegoniophore is present in:
Given below is the diagram of a bacteriophage. In which one of the options, all the four parts A, B, C and D are correct?
Chrysophytes, euglenoids, dinoflagellates and slime moulds are included in the kingdom:
Which of the following statements is wrong for viroids?
Cell wall is absent in: