AP BIOLOGY

Detailed explanation-1: -Hence, the correct answer is ‘Leptotene’

Detailed explanation-2: -Under the microscope in its extended form, chromatin looks like beads on a string. The beads are called nucleosomes. Each nucleosome is composed of DNA wrapped around eight proteins called histones.

Detailed explanation-3: -Chromatin is visible as entangled mass of thread like structures. Chromatin is a complex of macro-molecule found in cells, consisting of DNA, protein and RNA. In a cell which is not dividing, this DNA is present as a part of chromatin material.