Meiosis

2 types of cell division

Mitosis

Meiosis

What is meiosis

A Type of cell Division which forma gametes(ovary and sperm)

What type of Cells Are gametes

Haploid cells

What is a haploid cell

A Type of cell that has half the number of chromosomes as Normal Body cells

Why is it important gametes habe half the number of chromosomes

So they zygote has the correct number of chromosomes

Where does meiosis take place

Only in reproductive organs

What Happens in First Stage of meiosis

Genetic information/chromosomes are copied

Second Stage of meiosis

Cell divides into two

During Division random chromosomes from each pair moves to one end of the cell

Third Stage of meiosis

Randlm chromosomes go into each new Gamete ( 4 non identical daughter cells)

Chromosomes are now single and not paired

What does meioses produce

4 gamates from the Original cell

What does each gamete have

Different alleles

Summarise meiosis

Halves the number of chromosomes and produces gametes

What Happens After meiosis

Fertilisation

What happens during fertilisation

The gametes join together

What does fertilisation do

Restore the fu number of chromosomes

What happens after fertilisation

The new cell divides by mitosis producing a clump of identical cells

What is an Embryo

A clump of Identical cells

Similarities between meiosis and mitosis

Both are types of cell division

DNA is First replicated

Chromosomes line up at centre of cell at one point

Both produce daughter cells

Differences between meiosis and mitosis

Meiosis produces 4 non identical daughter cells, whereas mitosis produces 2 identical daughter cells

Meiosis produces gametes, mitosis Producer normal cells

Mitosis forms diploid cells, meiosis forms haploid cell

Mitosis has 1 cell Division and meiosis has 2