AP BIOLOGY

Detailed explanation-1: -The first and longest phase of mitosis is prophase. During prophase, chromatin condenses into chromosomes, and the nuclear envelope (the membrane surrounding the nucleus) breaks down. In animal cells, the centrioles near the nucleus begin to separate and move to opposite poles of the cell.

Detailed explanation-2: -Chromatin condensation begins during prophase (2) and chromosomes become visible. Chromosomes remain condensed throughout the various stages of mitosis (2-5).

Detailed explanation-3: -In Meiosis 1, chromatin condenses to chromosomes, they pair up(prophase 1), they align in line(metaphase 1), each chromosome from a pair is separated and transported to opposite poles( during anaphase 1), then chromosomes decondense and nuclear envelope surrounds them(telophase 1), which disappeared in prophase 1.

Detailed explanation-4: -Meiosis I, the first meiotic division, begins with prophase I. During prophase I, the complex of DNA and protein known as chromatin condenses to form chromosomes. The pairs of replicated chromosomes are known as sister chromatids, and they remain joined at a central point called the centromere.