Human Reproduction Notes
ALDRO SCIENCE DEPARTMENT
Asexual reproduction - Only one parent. It occurs mainly in organisms whose bodies
have a simple structure.
Amoeba ( animal example )
BINARY FISSION
Yeast ( plant example )
BUDDING
Sexual reproduction - Two parents. Parents produce Gametes [sex cells] from sex
organs. At fertilisation the gametes join together to form a single cell called a
Zygote. This grows and divides many times to form a new organism.
Embryo - does not look like a baby.
Foetus - does look like a baby.
Left Kidney
Male
Ureter
Bladder
[stores urine]
Sperm Duct
Testis
[produces sperm]
Scrotum
Urethra
Penis
Glands
[producing the
liquid part of the
semen]
Foreskin
Ureter
Oviduct
Left Ovary
Bladder
[moved to
one side to
show the
vagina]
Uterus
[one egg a
month,
alternate
ovaries].
Vagina
Urethra
Female
Human Egg X 2
Mother’s blood
into the placenta
.
Human Sperm X 500
placenta
Foetus [ Baby ]
[ filled with food and
oxygen for the baby]
Amnion
[ cushions the baby ]
Mother’s blood
leaving placenta
[ with carbon
dioxide, urea & other
waste.]
Umbilical
cord
The Human Gestation Period is 9 months [ fertilisation to birth.]
Genes are the genetic code found in every organism, which determine all it’s
features [hair colour, eye colour etc.] Genes are on Chromosomes [ long thin strands,
made of D.N.A. ] There are normally 46 Chromosomes [23 pairs] in a human cell
nucleus, but the gametes only have half [one of each pair].
Cell
Nucleus
One pair of chromosomes
(out of 23) shown. Each
section is a different
gene.
One came
from the mother,
one from the
father.