NEET BIOLOGY

Detailed explanation-1: -At the end of prometaphase I, meiotic cells enter metaphase I. Here, in sharp contrast to mitosis, pairs of homologous chromosomes line up opposite each other on the metaphase plate, with the kinetochores on sister chromatids facing the same pole. Pairs of sex chromosomes also align on the metaphase plate.

Detailed explanation-2: -There are 4 sub-phases in meiosis I: • Prophase I: During prophase I, homologous chromosomes line up side by side. They are physically in contact with one another. This process is known as synapsis. Synapsis is when crossing over occurs.

Detailed explanation-3: -The other is to create genetic diversity. Meiosis begins like mitosis: the cell copies each chromosome. But unlike in mitosis, homologous chromosome pairs line up and exchange pieces-a process called recombination. Remember, homologous chromosomes have the same genes but with slight differences.

Detailed explanation-4: -A couple of homologous chromosomes, or homologs, are a set of one maternal and one paternal chromosome that pair up with each other inside a cell during fertilization.