Cell Division Flashcards
Chromosome
Coiled threads of DNA that become visible in the nucleus at cell division
Gene
A section of DNA that contains the instructions for the formation of a protein
Haploid cell
Has one set of chromosomes n=23
Diploid cell
has two sets of chromosome 2n=46
Homologous pair
Two chromosomes of similar size with the same sequence of genes
Cell cycle
90%Interphase
10%cell division
Interphase
The part in a cells life when its not dividing
Mitosis
A form of nuclear cell division in which one nucleus divides to form two nuclei, each containing the same number of chromosomes with identical genes
Function of mitosis
Unicellular organism- method of reproduction
Multicellular organism-growth and repair of cells
Meiosis
A form of nuclear division in which four daughter nuclei contain half of the chromosome number of the parent nucleus
Function of meiosis
Allows for sexual reproduction
Allows variation in organism
Difference between mitosis and meiosis
Mitosis has two daughter cells with the same no. chromosomes
Meiosis has four daughter cells with half the no. chromosomes
Mitosis daughter cells are genetically identical to its parents meiosis daughter cells can’t relate
MiTosis has Two daughter cells meiosis has four
Steps in Mitosis
Prophase
Metaphase
Anaphase
Telophase
Prophase
Nuclear wall begins to break down
Chromatin contracts and become visible double stranded
Chromatids held together by centromere
Centreole begin to form
Metaphase
Nuclear wall is fully broken down
Centreoles are at each side of the cell
Chromosomes are at the middle of cell forming an equator
Spindle fibres from centreole attach to centromere
