I
Gamete : half the number of chromosomes
e g
-
.
in
human : human cel has 46
↳
Sperm -
23 +
egg
-
23
if a person
has 47 chromosomes have down sydrome
if a person has 45 chromosomes have turner sydrome
Zygote : a fertilised egg cell -
it splits into an embryo
Embryo : a group of cens that form a multicellur organism
External Fertilisation
fish in the sea :
female fish drops loads of eggs
the eggs have an enzyme that the male fish detect so that
they know that it is the same species
the male fish ejaculates on the eggs and then leaves
not all eggs will be fertilised due to external factors
e g
. washed
.
away , eaten by predators or died
Internal Fertilisation
birds and humans : Sexual intercouse
ovary : where theeggs are Oviduct : fallopian tube Cold name
matured and .
released
T lined with . The
Cillia cillia 'waft' the
↳ the hormone FSH melps tO egg along towards the uterus
stimulate the ovaries where fertilisation occurs
the normone IH causes the
·
ovary to release the egg
FSH and LH are produced in the -
pitutary gland in the brain uterus : this is where implantation can
secrets destrogen and progesterone occur
. A placenta can develop here
.
↳ foetus will grow in the uterus
lining of the uterus : I
-
progesterone allows living to stay thick ; the placenta will develop in the lining
if you are not pregnant , progesterone levels drop ,
you have a placenta
Cervix :
·
closed passage Vagina :
closes the uterus Off "birth Canal"
·
muscular muscular passage
Gamete : half the number of chromosomes
e g
-
.
in
human : human cel has 46
↳
Sperm -
23 +
egg
-
23
if a person
has 47 chromosomes have down sydrome
if a person has 45 chromosomes have turner sydrome
Zygote : a fertilised egg cell -
it splits into an embryo
Embryo : a group of cens that form a multicellur organism
External Fertilisation
fish in the sea :
female fish drops loads of eggs
the eggs have an enzyme that the male fish detect so that
they know that it is the same species
the male fish ejaculates on the eggs and then leaves
not all eggs will be fertilised due to external factors
e g
. washed
.
away , eaten by predators or died
Internal Fertilisation
birds and humans : Sexual intercouse
ovary : where theeggs are Oviduct : fallopian tube Cold name
matured and .
released
T lined with . The
Cillia cillia 'waft' the
↳ the hormone FSH melps tO egg along towards the uterus
stimulate the ovaries where fertilisation occurs
the normone IH causes the
·
ovary to release the egg
FSH and LH are produced in the -
pitutary gland in the brain uterus : this is where implantation can
secrets destrogen and progesterone occur
. A placenta can develop here
.
↳ foetus will grow in the uterus
lining of the uterus : I
-
progesterone allows living to stay thick ; the placenta will develop in the lining
if you are not pregnant , progesterone levels drop ,
you have a placenta
Cervix :
·
closed passage Vagina :
closes the uterus Off "birth Canal"
·
muscular muscular passage
