meiosis Flashcards
meiosis
cell division, which creates four daughter cells
haploid
cell containing one copy of each chromosome
diploid
cell containing two copies of each chromosome, maternal + paternal
haploid cells in human body
gametes, created through meiosis
gametes function
used in sexual reproduction, where gametes will fuse in a process called fertilization to create a zygote
meiosis function
allows creation of gametes, and therefore allows sexual reproduction
step 0 of meiosis: before cell division starts
parent cell replicates DNA
step 1 of meiosis
nuclear membrane breaks down and homologous chromosomes line up at equator of cell next to each other
step 2 of meiosis
fibres pull the chromosomes away from each other and to the poles of the cell
step 3 of meiosis
fibres pull the chromosomes away from each other and to the poles of the cell
step 4 of meiosis
cell membrane pinches apart the daughter cells
step 5 of meiosis
nuclear membrane breaks down and chromosomes move to center of cell
step 6 of meiosis
sister chromatids are pulled to poles of cell by fibres and separated
step 7 of meiosis
cell membrane pinches apart daughter cells
parent cells and daughter cells
parent cell carries different genetic information to daughter cells
fertilisation
a process occurring in sexual reproduction, when gametes fuse to create a zygote
why are gametes haploid
when the gametes fuse, they will combine to give the resulting zygote two sets of genetic information, one paternal and the other maternal, therefore turning the zygote into a diploid cell with the correct no. of chromosomes