Compare and contrast meiosis 1 and 2?

Answer 1

Meiosis I:

• Starts with a homologous chromosome pair
• • Lines up at the center of the cell
• "S" Phase - DNA synthesizes prior to Meiosis I
• 2N --> N
• 2 unique cells
• Crossing-over
• Chromosomes separate

Meiosis II:

• Starts with sister chromatids
  • Lines up at the center of the cell
• No "S" Phase - DNA does not synthesize prior to Meiosis II
• N --> N
• 4 unique cells
• No crossing over
• Chromatids separate

Answer 2

Ok so first, the chromosome pairs line up in the center of the cell, then the pairs seperates and move to opposites ends of the cell, then two cells form, each with half the number of chromosomes. Each chromosome still has two chromatids. The chromosomes with their two chromatids move to the center of the cell. The centromeres split, and the chromatids seperate. Single chromosomes move to opposite ends of the cell. Now four sex cells have been produced. Each cell has only half the number of chromosomes that the parent cell had at the beginning of meiosis. Each cell has only one chromosome from each original pair.

Answer 3

Meiosis I involves homologous chromosomes separating, resulting in two daughter cells with half the number of chromosomes as the parent cell. During Meiosis II, sister chromatids separate, resulting in four daughter cells with a haploid number of chromosomes. Meiosis I also includes crossing over and independent assortment, while Meiosis II is more similar to mitosis with no genetic recombination.