2381494
Description
Flashcards by Charlotte Hewson, updated more than 1 year ago
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Created by Charlotte Hewson
over 9 years ago
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| 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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