NEET BIOLOGY

Detailed explanation-1: -Synapsis is the pairing of two homologous chromosomes that occur during meiosis. This takes place during the prophase stage of meiosis I. When homologous chromosomes pair, the homolouges cross over and exchange genetic material at certain points. This process is called crossing over.

Detailed explanation-2: -During prophase I, homologous chromosomes pair and form synapses, a step unique to meiosis. The paired chromosomes are called bivalents, and the formation of chiasmata caused by genetic recombination becomes apparent.

Detailed explanation-3: -There are 23 pairs of homologous chromosomes, or homologues, in each cell. After replication there are a total of 92 sister chromatids in each cell. There are 46 individual chromosomes in each cell. Metaphase: During metaphase, each of the 46 chromosomes line up along the center of the cell at the metaphase plate.

Detailed explanation-4: -The data conclude that, in the absence of major chromosome fluctuations perpendicular to the centrosome axis during mitosis, the axis-dependent segregation between a pair of homologous chromosomes is conserved from metaphase to anaphase.