Oh Me, Oh My, Oh Meiosis

What is the end result of meiosis?

4 different haploid gametes 4 different sex cells with 23 chromosomes

Gamete

A sex cell such as a sperm or an egg

crossing over

An event that occurs during prophase I to increase genetic variation

Prophase I

Crossing over occurs, exchange gene segments

Meiosis

Forms four daughter cells that are not identical and have a haploid chromosome number.

Telophase II

Four haploid gametes are formed

Why is meiosis necessary?

Half genetic info from both parents and it makes unique individuals

Metaphase I (Meiosis)

Homologous chromosomes line up at the cells equator

Anaphase I (Meiosis)

Homologous chromosomes separate to opposite poles of the cell

Oogenesis

Meiosis in females

Tetrads

Replicated homologous chromosomes that form a total of four chromosomes

Anaphase II

Sister chromatids are separated to opposite poles of the cell

Metaphase II

Sister chromatids line up at the cells equator

homologous chromosomes

The same size and same genes and same locations

Telophase I

Two haploid cells are formed

What cells undergo meiosis?

gametes

Spermatogenesis

the production of sperm cells