Card Set Information
What are the three major stages?
How many cells do we begin with?
2, sperm cell, egg cell.
The point of fertilization is when sperm nucleus meets egg nucleus
when the egg is fertilized, it beocmes a ZYGOTE
goal of cell cycle?
to create a new somatic cell which is exactly like the parent cells when the daughter cells are created form parent cells.
parts of interphase?
"G1" or gap 1 phase, s phase or synthesis phase, gap2 of G2 phase
Gap 1 phase?
when cell growth and developement occurs
the cell matures and becomes bigger
does its job
the synthesis phase. DNA replication where the chromatid is replicated into a sister chromatid (chromosome)
when organelles needed for cell division are made (centrioles, spindle fibres)
centrioles and spindle fibres are only found in G2 phase
what are chromatids
the two identical parts on a chromosome
what is the centromere?
the middle part of the chromosome that holds together the sister chromatids
has four part
: PROPHASE, METPHASE, ANAPHASE, TELOPHASE
process by which the nucleus of the cell is divided into two nuclei each with the same number of chromosomes as the parent cell.
first stage of mitosis
lognest stage of mitosis.
chromosomes become apparent/appear
centrioles move to opposite ends of the cell
nucleolus and nuclear membrane dissintergrate and break down.
2nd phse of mitosis
chromosomes line up at the centre of the cell by the centromeres
3rd phase of mitosis
sister chromotids separate to form indivitual chromosomes
anaphase ends whent eh movement of chromosomes stop at opposite ends of the cell
final and fourth stage of mitosis
chromosomes uncoil into chromatin
nuclear membrane reforms
spindle fibres break apart
NOT part of mitosis
the cytoplasm of the cell divides
forms two daughter cells that are exactly like the parent cell (each ahve one complete set of chromosomes)