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MIEOSIS II by Mind Map: MIEOSIS II

1. PROPHASE II

1.1. Each of the daughter cell forms a spindle & double stranded chromosomes move toward the equator

2. METAPHASE II

2.1. The chromosomes are positioned on the metaphase plate in a mitosis-fashion

3. ANAPHASE II

3.1. The centromeres of sister chromatids finally seperate.

3.2. Sister chromatids of each pair move toward opposite poles

4. TELOPHASE II

4.1. Nuclei form at opposite poles of the cell, cytokinesis occur

4.2. Four daughter cells, haploid (n)

5. COMPARISON

5.1. MITOSIS

5.1.1. 1.Within somatic cell

5.1.2. 2. one single division ( 2 diploid (2n) daughter cells identical to parent)

5.1.3. 3. Mitotic mother cell - haploid or diploid

5.1.4. 4. no DNA exchange between chromosomes (crossing over)

5.2. MEIOSIS

5.2.1. 1.within gamete cell

5.2.2. 2. two division ( 4 haploid (n) daughter cells not identical to parent)

5.2.3. 3. meiotic mother cell - always diploid

5.2.4. 4. At least one crossing over or DNA exchange per homologous pair of chromosomes

6. GENETICS VARIATION

6.1. INDEPENDENT ASSORTMENT OF CHROMOSOMES

6.1.1. Each pair of chromosomes sorts maternal and paternal homologous into daughter cells independently of the other pairs

6.2. CROSSING OVER

6.2.1. Contributes to genetics variation by combining DNA from two parents into a single chromosomes

6.3. RANDOM FERTILIZATION

6.3.1. Any sperm can can fuse with any ovum (unfertilized egg)