Directions : In the following question more than one of the answers given may be correct. Select the correct answer and mark it according to the code:
Identify the correctly matched pair(s). (1) Chromonema ? A localized condensed region of chromosome (2) Non-disjunction ? The failure of chromosomes to be separated during meiosis or mitosis (3) Master and slave ? Polytene chromosome hypothesis (4) Chromocentre ? Lampbrush chromosomeA) 1, 2 and 3 are correct
B) 1 and 2 are correct
C) 2 and 4 are correct
D) 1 and 3 are correct
Correct Answer: B
Solution :
Chromonema is a localized condensed region of chromosome. The term 'non disjunction' refers to the failure of chromosomes to be separated during meiosis or mitosis. 'Master and slave hypothesis' was proposed by Callan and Lloyd (1960) for lampbrush chromosome. Chromocentre is a structure from which arms of polytene chromosome radiate. It is formed by the fusion of centromeric regions of all the chromosomes and in males, entirely Y-chromosome.
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