22. How are chromatin.chromatid and chromosoms related to each other?
23. Describe different types in xylem and phlorm
24. Draw well labelled diagram of various type muscles found in human body.
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When a cell starts to divide, the tangled mass of chromatin condense into long threads and finally, rod-like bodies called chromosomes. A chromatid is one copy of duplicated chromosome which is generally joined to the other copy by a centromere.
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