Question

Assertion : The lampbrush, chromosomes are called diplotene chromosomes bivalents.
Reason : The number of loops is maximum during diplotene.
A. If both the assertion and the reason are true and the reasons is a correct explanation of the assertion
B. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
C. If the assertion is true but the reson is false
D. If both the assertion and reason are false

Answer 1

Correct Answer - B
The lampbrush chromosomes are highly elongated special kind of synapsed mid-prophase or diplotene chromosome bivalents which have already undergone crossing over. They occur in diplotene stage of most animal occystes, spermatocytes of many and even giant nucleus of unicellular alga Acetabularia. the number of pairs of loops gradually increase in meiosis till it reaches maximum is diplotene.