, Describe the stages of the cel cycle in eukaryotic cells :
1) interphase
● (s phase) DNA replicates semi-conservatively leading to 2 chromatids (identical copies)
joined at the centromere
● (G1/G2) number of organelles and volume of cytoplasm increases, protein synnthesis
2) mitosis
● nucleus divided
● Produces 2 nuclei with identical copies of DNA produced by parent cell
3) cytokinesis
● cytoplasm and cell membrane divide
● To form 2 new genetically identical daughter cells
describe the role and behaviour of the chromosomes and spindle bres in mitosis
Stage 1 ( prophase) :
● chromosomes condense becoming shorter/ thicker and visible
● Appear as 2 sister chromatids joined by a centromere
● Nuclear envelope breaks down
● Centrioles move to opposite poles formingle spindle networks
stage 2 (metaphase):
● spindle bres attach to chromosomes by their centromere
● Chromosomes align along equator
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1) interphase
● (s phase) DNA replicates semi-conservatively leading to 2 chromatids (identical copies)
joined at the centromere
● (G1/G2) number of organelles and volume of cytoplasm increases, protein synnthesis
2) mitosis
● nucleus divided
● Produces 2 nuclei with identical copies of DNA produced by parent cell
3) cytokinesis
● cytoplasm and cell membrane divide
● To form 2 new genetically identical daughter cells
describe the role and behaviour of the chromosomes and spindle bres in mitosis
Stage 1 ( prophase) :
● chromosomes condense becoming shorter/ thicker and visible
● Appear as 2 sister chromatids joined by a centromere
● Nuclear envelope breaks down
● Centrioles move to opposite poles formingle spindle networks
stage 2 (metaphase):
● spindle bres attach to chromosomes by their centromere
● Chromosomes align along equator
fi
