By B.L. Chaudhary

The subject material is up to date and provides an perception of the topic intimately. After facing the manuscript, the readers may be able with a whole power to get luck within the lifestyles sciences part. each one bankruptcy is supplemented with perform attempt papers. 8 chapters containing 10 version attempt papers is incorporated to offer education to the scholars of this steam. version try out papers contain questions about arithmetic, desktop technological know-how, Geography, Physics, Chemistry and lifestyles Sciences which shape the curriculum of Part-A of Paper-I. bankruptcy nine is especially designed to provide reminiscence dependent existence technology query papers of previous few years. resolution keys for perform try out papers, version attempt papers and former yr web try out papers also are supplied. this can be the 1st try out in India to supply all crucial elements in one name to get convinced good fortune for web exam performed via CSIR-UGC in India.

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Which of the following is correct with regard to aneuploidy? (a) inversion (b) 2n + 1 (c) All aneuploid individuals die before birth. (d) 4n 51. If a fragment of a chromosome breaks off and then reattaches to the original chromosome but in the reverse direction, the resulting chromosomal abnormality is called (a) a deletion. (b) an inversion. (c) a translocation. (d) a nondisjunction. 52. Why are individuals with an extra chromosome 21, which causes Down syndrome, more numerous than individuals with an extra chromosome 3 or chromosome 16?

The kinetochore is located in the region around the centromere and is the site where microtubules attach to the chromatids. Chromosome movements are highly organized 8. The movement phases of chromosomes are designated pro-metaphase, metaphase, and anaphase. 9. During pro-metaphase, the nuclear lamina disintegrates and the nuclear envelope breaks into small vesicles permitting the fibers of the spindle to “invade” the nuclear region. • The spindle microtubules then associate with kinetochores. • These are called kinetochore microtubules.

49. Anaphase is a rapid phase lasting only 2-3 minutes. It starts abruptly. The centromere splits into two; each chromatid is pulled slowly towards a spindle pole (each chromatid with own centromere now becomes a separate single stranded (1 DNA) chromosome. The chromatids are moved (towards the pole they face) at a speed of 1µm/minute. The separation of the chromatids starts at the centromeres while the arms trail behind it. As a result, the chromosomes are pulled into V, J and T shapes. 50. The telophase lasts for an hour or so.

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