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Lecture 7

PSYA02H3 Lecture Notes - Lecture 7: Sexual Differentiation, Fetus, Teratology

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Why is this interesting?
Because humans are unique
Animals use the quantity strategies where they make a lots of
offspring and they have enough survive
For humans they have very few offspring but they require lots
of attentions and takes a lot to raise them
Some methods and terminology
Cross sectional study: compare different individual in
different ages and groups and study how they react to certain
Longitudinal study: study specific individual measuring
certain traits over time and example, study 1 children over
certain ages
Prenatal stage ( 38 week): different stages in that
o Zygote: first two weeks
o Embryonic stage: two to 8 weeks
o Fetal stage: last seven months
Infant stage: Birth to two years
Adolescent: harder to define
Adult stag: Old age
Prenatal development
Zygote Sperm fertilize the egg egg starts to divide and
multiply and differentiate into different kinds of cells but they
all have the same DNA
Embryonic at this point the hear begins to beat they
have the sensitivity to teratogens, this is when the fetus is
very sensitive to chemicals sexual differentiation becomes
clear gender if the baby is boy them the androgen is
released then males are actually formed
Fetal stage bones start to form and the baby really starts
to grow this is after two months
Very difficult to know when the baby comes human because
this is a very continuous process
It is the development of your perceptional skills
You must hold the baby’s head, because their body can not
hold their head
A lot of this is about muscles, bones, and many other part of
baby’s are develop
most children have a naïve sense of gravity
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