Life Of A Cell Flashcards
Definition Interphase
Metabolic activities a cell is differentiated and specialised for
Interphase-
Starts after cell has formed
Lasts into cells mature stages
Ends when division stage starts
Mitosis purpose
Make exact duplicates of nucleuses DNA
Cytokinesis
Division of cytoplasm
Mitosis results
Two daughter cells formed identical to each other and mother cell
Mitosis is responsible for
Growth
Replacement of damaged tissue
Reproduction of unicellular organisms
Chromosome number
Stays the same
Body cells
Somatic cells
Sex cells (gametes)
Egg and Sperm
Cell division 2 parts
Mitosis and meiosis
Mitosis
Type of cell division that occurs in somatic cells
Phases of mitosis (4)
Prophase
Anaphase
Telophase
Interphase
Prophase
Chromatin shortens and thickens
DNA duplicates
Nuclear membrane disappears
Nucleolus disintegrates
Nuclear plasm gel > soo
Centrioles double > move to opposite poles
Cytoplasmic threads appeae (centrioles)
Metaphase
Chromosomes arrange at equator of cell
Centromere lies on spindle thread
(Middle phase)
Anaphase
Spindle threads shrink
Centromere splits into 2
Chromatids are separated - go to opposite ends of the cell
Each chromatid is a single stranded chromosome
Chromatids
Daughter chromosomes
Telophase
Chromatids John to form a chromatin network
Nuclear membrane appears
Nucleolus reappears
Interphase
Preparation for nuclear division
DNA replicates > genetic material in the chromatin is doubled
Karyokinesis
Division of nucleus
Mutation
When a mistake or change occurs during replication of DNA
Mutation results
Can be deadly
Can advantage the organism
Contributes to development of new species
