Chapter 3 Meiosis Flashcards
Definition of mitosis
Division of the nucleus of a cell
Phases of interphase
G1, S, G2 phases
Significance of S phase of interphase
Doubling of DNA
Form of DNA in interphase
Chromatin
Number of strands of DNA in a human cell
46
Phase in interphase when proteins and enzymes needed for cell division are made
G2 phase
Phases of mitosis
Prophase metaphase anaphase and telophase
Phase in which chromosomes condense
Prophase
Number of strands of DNA in one chromosome during prophase
Two
Number of centrioles in a centrosome
Two
Place on a chromosome with two DNA strands join
Centromere
Phase where centromere’s line up along the middle of the cell
Metaphase
Part of chromosome where spindle fibers attach
Centromere
Miotic spindle is made of these protein structures
Microtubules
Phase when the centromere splits
Anaphase
Phase during which the nuclear membrane reforms
Telophase
Name for the division of the cytoplasm
Cytokinesis
Examples of cells that do not undergo mitosis (for all practical purposes)
Red blood cells sperm neuron and cardiac muscle cell
Process by which a cell divides into cells with half the number of chromosomes
Meiosis
Examples of cells that undergo meiosis
Cells that become sperm or eggs
Chromosomes that code for the same traits
Homologous chromosomes
Cells that contain homologous chromosomes (two of each)
Diploid cells
Longest phase in the cell life cycle
Interphase
Number of centrosomes during prophase
Two
phase when the nuclear membrane disappears
Prophase
Phase when the sister chromatids migrate to the opposite end of the cell
Anaphase
Phase when cytokinesis is occurring
Anaphase and telophase