Transcript Mitosis vs. Meiosis

Mitosis vs. Meiosis
Division of body cells and sex cells.
Body cells have the same number of chromosomes as
the parent cells (46-46)
Sex cells have half the number of chromosomes as the
parent cells (46-23)
Asexual reproduction- requires only one parent cell
Sexual reproduction- requires two parent cells
Mitosis
Parent Cell
46
Daughter
Cell 46
Daughter
Cell 46
Parent Cell
46
Meiosis
First
Division
46
Sex
Cell 23
Sex
Cell 23
First
Division
46
Sex
Cell 23
Sex
Cell 23
Sexual Reproduction:
Female sex cells are called eggs.
Male sex cells are called sperm.
Sex cells are known as haploids
because they have half of the
genetic material. (Half from the
egg and half from the sperm.)
Females release one egg from an
ovary each month. If the egg is not
fertilized, the egg will leave the
body with menstruation.
Average 28 day cycle.
Fertilization occurs with the
union of the egg (23) and the
sperm (23).
The union creates a zygote (46
chromosomes). The zygote cell
is a diploid (full number).
Who determines the sex of the offspring?
So…
XX- female
XY- male
The zygote begins to grow
into an embryo by the
process of mitosis or body
cell division.
How do twins form?
Identical
Fraternal
Identical Twins Sonogram
Fraternal Twins Sonogram
Siamese Twins are identical twins that have not entirely separated.
Feature:
Mitosis:
Meiosis:
Beginning Cell-
Body Cell
Body Cell
# of cells produced- 2
4
End product cell-
Body Cell
Sex Cell
# of chromosomes-
46
23
Type of
reproduction-
Asexual
Asexual