Meiosis Practice Formative

Produces cells with half of the genetic material in them

Is intended to repair tissue or grow the organism

Has two rounds of cell division

Produces identical cells (identical to each other and to the parent) as long as there are no mutations

Produces cells that can be used in sexual reproduction

Produces diploid cells

Produces 4 cells

Produces haploid cells

In a human it only in the ovaries or testes

Produces two new cells

Makes sex cells/gametes

The nuclear envelope breaks down

Spindle fibers that aren't connected to chromosomes start to stretch the cell

Centrioles produce spindle fibers

Spindle fibers pull apart the homologous pairs (separating the tetrads)

Spindle fibers break down

2 new nuclei may form

Tetrads form

DNA coils and chromosomes form

Cell divides into 2

Crossing over occurs

Spindle fibers move tetrads to the midline of the cell

Spindle fibers break down

Spindle fibers pull apart the sister chromatids

4 new nuclei form

The number of chromosomes doubles in the cell

DNA coils and chromosomes form (if the DNA uncoiled in the previous step)

The cell divides into 4 new haploid cells

Spindle fibers move chromosomes to the midline of the cell (not in pairs)

Spindle fibers continue to be formed

Nuclear envelope breaks down (if two new nuclei were formed in the previous step)

Spindle fibers stretch out the cell

The DNA uncoils

FYI: the top and bottom chromosomes are intended to be the same size