Cell Cycle and Cell DivisionHard
Question
Lampbrush chromosomes occur during
Options
A.prophase of mitosis
B.diplotene of meiosis
C.metaphase of meiosis
D.interphase
Solution
Lampbrush chromosomes were reported by W Flemming (1882) and described by Ruckert (1892) from nuclei of yolk rich primary oocytes of newts and frog (amphibians), also in sper matocytes of many animals. These are found in permanent diplotene stage of meiosis and do not undergo cell cycle. Each such chromosome has a double main axis made up of DNA and histones. The chromosome has a double main axis made up of DNA and histones. The chro mosomes are coiled and held at many places forming cross like structure called chiasmata. Loops arising laterally has uncoiled DNA which helps in rapid transcription and yolk synthesis.
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