Cell cycle

Interphase

The phase of the cell cycle where the cell grows and prepares for division, comprising G1, S, and G2 phases.

G1 Phase

The first phase of Interphase where the cell grows and synthesizes proteins for DNA replication.

S Phase

The phase of the cell cycle where DNA is replicated, resulting in two sister chromatids for each chromosome.

G2 Phase

The second phase of Interphase where further cell growth occurs and preparations for mitosis take place.

Mitosis

The process of nuclear division in the cell cycle, including prophase, metaphase, anaphase, and telophase.

Cytokinesis

The division of the cytoplasm during the cell cycle that results in two daughter cells.

Meiosis

A type of cell division that results in four genetically distinct haploid daughter cells.

Prophase I

The stage of Meiosis I where homologous chromosomes pair and exchange genetic material through crossing over.

Anaphase I

The stage of Meiosis I where homologous chromosomes are pulled apart to opposite poles of the cell.

Telophase II

The final stage of Meiosis II where nuclei reform and four genetically distinct haploid daughter cells are produced.

What is Mitosis?

Mitosis is a type of cell division that results in two identical diploid daughter cells.

What is Meiosis?

Meiosis is a type of cell division that results in four genetically distinct haploid daughter cells.

Key difference: Number of Divisions in Mitosis

Mitosis involves one division process.

Key difference: Number of Divisions in Meiosis

Meiosis involves two division processes: Meiosis I and Meiosis II.

What is the purpose of Mitosis?

The purpose of mitosis is growth, repair, and asexual reproduction.

What is the purpose of Meiosis?

The purpose of meiosis is to produce gametes for sexual reproduction.

Prophase I

In Prophase I of meiosis, homologous chromosomes pair up and cross over.

Metaphase I

During Metaphase I, homologous pairs of chromosomes align at the cell's equator.

Anaphase II

Anaphase II involves the separation of sister chromatids to opposite poles of the cell.

Telophase I

In Telophase I, the cell divides into two haploid cells, each with half the chromosome number.

What are the steps of Meiosis II?

Meiosis II consists of Prophase II, Metaphase II, Anaphase II, and Telophase II.

Prophase II

The stage where chromosomes condense again, and a new spindle apparatus forms in each haploid cell.

Metaphase II

Chromosomes align at the equator of each haploid cell, and spindle fibers attach to centromeres.

Anaphase II

Sister chromatids are pulled apart to opposite poles of the cell.

Telophase II

Chromatids reach the poles, nuclear membranes reform, and the cell divides.

End Result of Meiosis II

Meiosis II results in four genetically distinct haploid daughter cells.

Importance of Meiosis II

Meiosis II is essential for reducing the chromosome number and ensuring genetic diversity.

What is a haploid cell?

A haploid cell has half the number of chromosomes (n) compared to diploid cells (2n).

Role of spindle fibers in Meiosis II

Spindle fibers help separate sister chromatids during Anaphase II.

Comparison of Meiosis I and Meiosis II

Meiosis I reduces chromosome number, while Meiosis II separates sister chromatids.