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The complex formed by a pair of synapsed homologous chromosomes is called
During zygotene, second stage of meiosis I, homologous chromosomes start pairing together forming a complex structure called synaptonemal complex. The complex formed by a pair of synapsed homologous chromosome is called a bivalent or a tetrad. Crossing over occurs between non sister chromatids of bivalent in the next stage
A stage in cell division is shown in the figure. Select the answer which gives correct identification of the stage with its characteristics.
Telophase is the stage of reconstitution of nuclei. The chromosomes that have reached their respective poles decondense and lose their individuality and collect in amass in the two poles. Nuclear envelope assemble around chromatin mass. Nucleolus, Golgi complex and ER re-form.
In meiosis I, a bivalent is an association of
What is not seen during mitosis in somatic cells ?
Synapsis is the pairing of homologous chromosomes during zygotene stage of prophase I of meiotic division-I. The homologous chromosomes come from the mother and father.
Sister chromatids
Crossing over and genetic recombination occur during prophase I.
Chiasmata are formed as a result of –
If we ignore the effect of crossing over, how many different haploid cells arise by meiosis in a diploid cell having 2n = 12
The number of different haploid cells arise by meiosis can be calculated by 2n where,n = number of haploid chromosome.
Prophase of reduction division is divided into number of stages. The correct chronological sequence is
Which of the following is unique to mitosis and not a part of meiosis ?
At metaphase of mitosis, each chromosome consists of__________ chromatid(s) _________ centromere(s)_______ kenetochore(s) and _______ molecules of DNA –