Transcript Slide 1 - Bloomfield Public Schools

MEIOSIS
• Meiosis is the process that occurs in the
formation of sex cells {Sperm and egg} by
which the number of chromosomes is
reduced by half.
MITOSIS
• The stage of the cell cycle during which the cell’s
nucleus divides into two new nuclei and one
copy of the DNA is distributed into each
daughter cell.
The cell grows to its mature size, makes a copy of its
DNA, and prepares to divide into two cells. Chromatin in
the nucleus condenses to form chromosomes. The
nuclear envelope breaks down. The chromosomes line
up across the center of the cell. The centromeres split.
the two chromatids separate. The chromosomes begin
to stretch out and lose their rodlike appearance. A new
nuclear envelope forms around each region of
chromosomes. Each daughter cell ends up with an
identical set of chromosomes and about half the
organelles.
Before meiosis begins, every
chromosome in the parent cell is copied. The
chromosome pairs line up in the center of
the cell. The pairs separate and move to
opposite ends of the cell. Two cells from each
with half of the number of chromosomes.
The chromosomes with their two chromatids
move to the center of the cell. Single
chromatids move to opposite ends of the
cell.
Created By: