الانقسام الخلوى: الطور التمهيدى الثانى للمرحلة الخامسة للانقسام الميوزى

The video tutorial explains the stages of meiosis II, starting with prophase II where spindle fibers form and chromosomes are present in a single set. It progresses to metaphase II, where spindle fibers attach to chromosomes at the cell equator. Anaphase II follows, with spindle fibers pulling chromosomes apart to opposite poles. In telophase II, new nuclear membranes form, resulting in four haploid cells. The tutorial concludes with the formation of haploid gametes from diploid cells, emphasizing the restoration of the diploid chromosome number upon fertilization.

What happens to DNA during the second prophase of the fifth stage of meiosis?

• It doubles in size.

• It does not replicate.

• It replicates.

• It disappears.

During the second metaphase, what is the role of spindle fibers?

• They dissolve.

• They attach to chromosomes and align them at the cell's equator.

• They cause chromosomes to disappear.

• They form new nuclei.

What occurs during the second anaphase of meiosis?

• New spindle fibers form.

• Spindle fibers contract and pull chromosomes to opposite poles.

• Chromosomes replicate.

• Chromosomes are pulled to the cell's equator.

What is the result of the final stage of meiosis?

• Two distinct haploid cells.

• Four distinct haploid cells.

• Four identical cells.

• Two identical cells.

What happens to the nucleus in the final stage of meiosis?

• It disappears completely.

• It forms a single large nucleus.

• It remains unchanged.

• It reappears in each of the four new nuclei.