packet Flashcards
What is the structure that organizes spindle fibers called?
centrosome
what makes up centrosomes?
centrioles
what is the act of cells separating called?
cytokinesis
during anaphase I of meiosis_____chromosomes separate, but in anaphase II _______ chromatids separate
homologous, sister
What is a type of cell that enters mitosis frequently?
stomach cells
During which phase do chromosomes condense
prophase
how many times does the cell divide during mitosis? Meiosis?
once in mitosis twice in meiosis
During what phase does crossing over occur?
Prophase I of meiosis
What event occurs in order for crossing over to occur?
synapsis
What three phase make up interphase?
G1, s-phase, G2
Aneuploid
Abnormal number of chromosomes
Polypoid
Entire set of chromosomes is duplicated
Trisomic
Gametes with an extra chromosome
Monosomic
Having only one copy of a particular chromosome
How many checkpoints in cell cycle?
Three checkpoints
What doe Rb suppress?
E2F
What is nondisjunction?
when chromatids fail to separate
what is synapsis?
The physical pairing of two homologous chromosomes in prophase I of meiosis
What does DNA in chromosomes wrap themselves around?
Histones
How do cells replicate
Growth, wound repair, and reproduction
What does DNA in chromosomes wrap themselves around?
Histones
How do cells replicate
Growth, wound repair, and reproduction
