What happens during prophase II of meiosis?

What happens during prophase 2 of meiosis quizlet?

In prophase II, the nuclear envelope breaks down and the spindle apparatus forms. The chromosomes become arranged on the metaphase plate, much as the chromosomes do in mitosis, and are attached to the now fully formed spindle.

What is the prophase II?

Prophase II is the phase that follows after meiosis I, or after interkinesis if present. If interkinesis takes place, the nuclear envelope and the nucleolus disintegrate during prophase II. The chromosomes are condensed. The centrosomes replicate and move towards the opposite poles.

What are the important events taking place during prophase 2 of meiosis?

Major Events in Meiosis

Stage Major Events
Meiosis II
Prophase II Chromosomes condense, the spindle forms, and the nuclear envelop disintegrates.
Metaphase II Individual Chromosomes line up on the metaphase plate
Anaphase II Sister chromatids separate, becoming individual chromosomes that migrate toward spindle poles

What happens during prophase I of meiosis?

During prophase I, the complex of DNA and protein known as chromatin condenses to form chromosomes. The pairs of replicated chromosomes are known as sister chromatids, and they remain joined at a central point called the centromere.

What exactly happens during prophase I?

During prophase I, homologous chromosomes pair and form synapses, a step unique to meiosis. The paired chromosomes are called bivalents, and the formation of chiasmata caused by genetic recombination becomes apparent. Chromosomal condensation allows these to be viewed in the microscope.

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What happens during prophase?

During prophase, the complex of DNA and proteins contained in the nucleus, known as chromatin, condenses. The chromatin coils and becomes increasingly compact, resulting in the formation of visible chromosomes. … The sister chromatids are pairs of identical copies of DNA joined at a point called the centromere.

What happens during metaphase II of meiosis quizlet?

What happens during metaphase II of meiosis? Sister chromatids are distributed in a single layer across the center of the cell. What happens during anaphase I of meiosis? Homologous chromosomes separate but sister chromatids remain joined at their centromeres.

Does crossing over occur during prophase II?

Crossing over does not occur during prophase II; it only occurs during prophase I. In prophase II, there are still two copies of each gene, but they are on sister chromatids within a single chromosome (rather than homologous chromosomes as in prophase I).

Does recombination occur in prophase 2?

Prophase II

Chromatin condenses to form visible chromosomes again. The nuclear envelope and nucleolus disintegrate, and spindle fibers begin to appear. No crossing over occurs.