Meiosis

Are gametes haploid or diploid

haploid

Are zygotes haploid or diploid

diploid

Haploid

2 sets of 23 chromosomes

Diploid

one set of 46 chromosomes

What is the key difference between mitosis and meiosis?

Mitosis generates 2 new diploid cells and meiosis

generates 4 new haploid cells

What does mitosis generate?

2 new diploid cells

What does meiosis generate

4 new haploid cells generated

What are the two parts of meiosis?

1) Meiosis I

2) Meiosis II

Products of Meiosis I

2 new haploid cells

Products of meiosis II

4 new haploid cells

Steps of Meiosis I

Prophase I, Prometaphase I, Metaphase I, Anaphase I, Telophase I, cytokinesis

Steps of Meiosis II

Prophase II, Prometaphase II, Metaphase II, Anaphase II, Telophase II, cytokinesis

Prophase I

Homologous chromosomes pair

together; nuclear envelope dissolves.

In what phase of Meiosis I can crossing over happen in

Prophase I

Prometaphase I

Mitotic spindle attaches to

homologous chromosome kinetochores

Metaphase I

Homologous chromosomes line

up at the metaphase plate

Anaphase I

Mitotic spindle pulls homologues apart

Telophase I & Cytokinesis

Nuclear envelope forms,

cytoplasm divides

Prophase II

Nuclear envelope dissolves

Prometaphase II

Mitotic spindle attaches to sister

chromatid kinetochores

Metaphase II

Sister chromatids line up at the

metaphase plate

Anaphase II

Mitotic spindle pulls sister chromatids

apart

Telophase II and Cytokinesis

Nuclear envelope forms, cytoplasm

divides