AQA Biology 11.2 mitosis

Charlotte Hewson
Flashcards by Charlotte Hewson, updated more than 1 year ago
Charlotte Hewson
Created by Charlotte Hewson about 6 years ago
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AS - Level AS Biology (unit 2 - 11. the cell cycle) Flashcards on AQA Biology 11.2 mitosis, created by Charlotte Hewson on 03/26/2015.

Resource summary

Question Answer
what is mitosis? produces 2 new daughter nuclei that have the same number of chromosomes as the parent cell and eachother
what is meiosis? produces 4 daughter nuclei, each with half the number of chromosomes as the parent cell.
what is the name of the stage before mitosis where the cell doesn't divide? interphase
what are the 4 stages of mitosis? -prophase -metaphase -anaphase -telophase
what happens in interphase? -cell is actively synthesising proteins -chromosomes are invisible -prior to mitosis , DNA replicates
what happens in prophase? -chromosomes become visible -nuclear envelope disintegrates -nucleolus disappears
what happens during metaphase? -spindle forms -chromosomes line up on equator of the cell
what happens during anaphase? -spindle fibres attached to chromatids contract -chromatids are pulled towards poles
what happens during telophase? -chromatids reach poles and become indistinct -nuclear envelope reforms -nucleolus reforms -spindle disintegrates -cell division begins
what are the three main reasons for making exact copies of the existing cells? -growth -differentiation -repair
are sperm and egg cells haploid or diploid? haploid
what do they become when they fuse? diploid cells
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