Meiosis – cont.

Prophase 1• Spindle forms• Nucleolus and

nuclear membrane dissolve

• Tetrads form• Crossing over

may occur (tetrads get tangled and exchange equal parts)

Metaphase 1 –tetrads line up in the middle

Anaphase 1 – tetrads are pulled apart

Telophase 1- spindle dissolves- nuclear envelope and nucleolus reform - 2 haploid cells form

The original and its duplicate from mom go to one daughter cell

The original and its duplicate from dad go to the other daughter cell

Prophase 2 – nuclear envelope and nucleolus dissolve, spindle forms

Metaphase 2 – choromosomes line up in the middle

Anaphase 2 – chromosomes are pulled apart

Telophase 2 – 4 haploid nuclei form

Spermatogenesis -formation of sperm- 4 haploid cells grow flagella

Oogenesis – formation of eggs- 4 haploid nuclei form, but only one gets cytoplasm and becomes an egg

- the other 3 have no cytoplasm, are called polar bodies, and die