Question

complete the following table on meiosis by filling in a description of the stage of meiosis on the left and draw a picture to represent that stage on the right.
prophase i
crossing over:
(draw pictures of both prophase i and crossing over)
metaphase i:
anaphase i:
telophase i and cytokinesis:

Explanation:

• Prophase I: Chromosomes condense, homologous chromosomes pair up (synapsis), and crossing - over (exchange of genetic material between non - sister chromatids of homologous chromosomes) occurs. The nuclear envelope breaks down, and spindle fibers start to form.
• Metaphase I: Homologous chromosome pairs (tetrads) align at the cell's equatorial plane (metaphase plate). Spindle fibers are attached to the centromeres of the homologous chromosomes.
• Anaphase I: Homologous chromosomes separate and are pulled to opposite poles of the cell by the spindle fibers. Sister chromatids remain attached at their centromeres.
• Telophase I and Cytokinesis: Chromosomes reach the poles of the cell. The nuclear envelope may re - form around each set of chromosomes (Telophase I). Then, cytokinesis occurs, dividing the cytoplasm and resulting in two daughter cells, each with half the number of chromosomes (but still in a replicated form as sister chromatids are still attached).

Answer:

• Prophase I: Chromosomes condense, synapsis and crossing - over occur, nuclear envelope breaks down, spindle forms.
• Metaphase I: Tetrads align at the equatorial plane.
• Anaphase I: Homologous chromosomes separate to opposite poles.
• Telophase I and Cytokinesis: Chromosomes at poles, nuclear envelope may re - form (Telophase I), cytoplasm divides (Cytokinesis).