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©laney lee 2019 meiosis i interphase the cell grows, replicates its dna…

Question

©laney lee 2019
meiosis i
interphase
the cell grows, replicates its dna, and prepares for division.
prophase 1
chromosomes condense, homologous chromosomes pair up, and crossing - over occurs.
metaphase 1
tetrads line up at the metaphase plate.
anaphase 1
homologous chromosomes separate and move to opposite poles.
telophase 1
chromosomes arrive at the poles, the cell starts to divide, and two haploid cells are formed.
meiosis ii
prophase 2
chromosomes condense again.
metaphase 2
chromosomes line up at the metaphase plate of the cells.
anaphase 2
sister chromatids separate and move to opposite poles.
telophase 2
chromosomes arrive at the poles, the cells divide, resulting in four haploid cells.
cytokinesis
the cytoplasm divides, resulting in four haploid cells.
draw and describe.

Explanation:

Brief Explanations

This problem is about the stages of meiosis (Meiosis I and Meiosis II) including Interphase, Prophase, Metaphase, Anaphase, Telophase, and Cytokinesis. The subfield under Natural Science that applies here is Biology, specifically cell biology or genetics which deals with cell division processes like meiosis. To solve (draw and describe) each stage:

  • Interphase: Cells grow, replicate DNA (chromosomes duplicate, exist as chromatin), and prepare for division. Draw: Cell with nucleus, chromatin (uncondensed chromosomes), organelles. Describe: "The cell undergoes growth, DNA replication (chromosomes duplicate), and prepares for meiosis. Chromosomes are in chromatin form (uncondensed), nucleus is intact, and cell organelles are present."
  • Meiosis I - Prophase 1: Chromosomes condense, homologous chromosomes pair (synapsis), crossing over occurs. Draw: Condensed chromosomes, homologous pairs (tetrads), nuclear envelope breaking down. Describe: "Chromosomes condense, homologous chromosomes pair up (form tetrads) in synapsis. Crossing over (exchange of genetic material between homologs) occurs. Nuclear envelope starts to break down, spindle fibers form."
  • Meiosis I - Metaphase 1: Tetrads (homologous pairs) line up at the metaphase plate (equator of the cell). Draw: Tetrads aligned in the middle, spindle fibers attached to centromeres. Describe: "Homologous chromosome pairs (tetrads) align at the metaphase plate. Spindle fibers from opposite poles attach to the centromeres of each homologous chromosome."
  • Meiosis I - Anaphase 1: Homologous chromosomes separate and move to opposite poles (sister chromatids remain attached). Draw: Homologous pairs moving apart, spindle fibers pulling them. Describe: "Spindle fibers pull homologous chromosomes (still with sister chromatids) to opposite poles of the cell. Sister chromatids remain connected at the centromere."
  • Meiosis I - Telophase 1: Chromosomes reach poles, nuclear envelopes may reform, cell starts to divide (cytokinesis begins). Draw: Two groups of chromosomes at poles, nuclear envelopes forming, cell membrane pinching. Describe: "Chromosomes reach the opposite poles. Nuclear envelopes may reform around each set of chromosomes. Cytokinesis (cell division) starts, forming two haploid cells (each with duplicated chromosomes, but half the original number of homologs)."
  • Meiosis II - Prophase 2: Chromosomes condense again (if decondensed), nuclear envelope breaks down (if reformed), spindle fibers form. Draw: Condensed chromosomes (each with two sister chromatids), spindle fibers, nuclear envelope absent. Describe: "Chromosomes (each with two sister chromatids) condense again. Nuclear envelope breaks down (if reformed in Telophase 1), spindle fibers form. Cells are haploid (n) but chromosomes are still duplicated."
  • Meiosis II - Metaphase 2: Chromosomes (each with two sister chromatids) line up at the metaphase plate (equator) of each haploid cell. Draw: Chromosomes aligned in the middle, spindle fibers attached to centromeres. Describe: "Chromosomes (each with two sister chromatids) align at the metaphase plate of each haploid cell. Spindle fibers from opposite poles attach to the centromeres of each chromosome."
  • Meiosis II - Anaphase 2: Sister chromatids separate (now called chromosomes) and move to opposite poles. Draw: Sister chromatids (now chromosomes) moving apart, spindle fibers pulling them. Describe: "Spindle fibers pull sister chromatids apart (now individual chromosomes) to opposite poles. Each chromatid is now a separate chromosome."
  • *…

Answer:

To solve, draw each stage with key features (chromosome structure, alignment, movement, nuclear envelope, spindle fibers) and describe the events as above. The subfield is Biology (Natural Science) focusing on meiosis (cell division).