Cell Division (Mitosis & Meiosis) (Ch. 11, 12-4) Flashcards
What is the correct sequence of the cell cycle?
g1, s, g2, = interphase
During which of the phases of interphase does DNA replication take place?
S phase- sythesis phase
What are the phases of mitosis?
Prophase, metaphase, anaphase, telophase
What takes place in prophase?
Prophase - centrioles, nuclear membrane, chromatin, spindle fibers
What takes place in metaphase?
chromosomes line up
What takes place in anaphase?
centromere divide & sister chromatids seperate
What takes place in telophase?
(Opposite of prophase) cleavage furrow, spindle fibers, nuclear membrane, chromosomes
The two sister chromatids are held together by the _
centromere
During what phase of mitosis do the centromeres split and chromatids seperate?
stage 3, anaphase
Compare and contrast mitosis and meiosis
mitosis - division of the cell nucleus (body cell)
meiosis - makes haploid cells (sex cells)
How is a zygote formed?
When an egg and a sperm combine. (fertilization)
What is crossing over? During which phase of meiosis does crossing over occur?
crossing over is the exchange of DNA between two homologous chromosome
- prophase 1