Question

Which stage is which

Answer 1

Answer:

See attachment for original image with letters and reordered image and letters

Prophase I - a

Metaphase I - q

Anaphase I - o

Telopase I - d

Prophase II - c, g

Metaphase II - n, j

Anaphase II - f, m

Telophase II - k, p

End of Meiosis II - b, e, h and l

Explanation:

Prophase I (a)- Meiosis begins with 2 copies of the DNA in the cell (2 homologous chromosomes). During prophase 1, chromosomes condense and are visible, and the nuclear envelope breaks down.Homologous chromosomes pair up, and crossing over occurs between them, exchanging genetic information before the formation of the gametes. The spindle fibres form at the opposite poles of the cell.

Prophase 1 is followed by Metaphase I (q). Metaphase I involves pairs of homologous chromosomes moving to the centre of the cell (sometimes called the equator or the metaphase plate). The spindle fibres attach to chromosomes at their centromere.

The next stage is called Anaphase I (o). During Anaphase I, the spindle fibres pull the homologous chromosomes to opposite poles of the cell, separating each chromosome from its homologue proper to the division of the cell into two daughter cells containing half of the genetic material

The final stage of meiosis I is called Telophase I (d). During telophase, the spindle fibres disappear and the nuclear envelope reappears. At the end of telophase, cytokinesis occurs. Cytokinesis is the process by which a cleavage furrow is created, the cytoplasm is split and the cell divides in two.

Meiosis I ends with 2 daughter cells (c and g), thus beginning Prophase II (c and g). During Prophase II, the nuclear envelope disappears again, the spindle fibres reform and chromosomes condense.

The next stage is Metaphase II (n and j during which the chromosomes again move to the centre of the cells, and are connected to spindle fibres at the centromere (on both sides of the centromere of a single chromosome) before proceeding to Anaphase II.

During Anaphase II (f and m), the spindle fibres pull the sister chromatids (formerly part of one chromosome) apart, moving them to the opposite sides of each daughter cell.

Telophase II (k and p) involves the de-condensation of the chromatids, the reformation of the nuclear envelope. Cytokinesis then occurs to split the cytoplasm of each cell into 2 new cells.

Meiosis II therefore completes with 4 haploid gametes (b, e, h, and l)