AP Biology Genetics and Development. ZYGOTE Fertilized egg of a frog.
Prenatal Development & The Newborn Baby. The Process… A zygote is a fertilized egg (conception...
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Transcript of Prenatal Development & The Newborn Baby. The Process… A zygote is a fertilized egg (conception...
![Page 1: Prenatal Development & The Newborn Baby. The Process… A zygote is a fertilized egg (conception – 2 weeks). Developing cells are known as an embryo.](https://reader036.fdocuments.in/reader036/viewer/2022062517/56649f355503460f94c53b5d/html5/thumbnails/1.jpg)
Prenatal Development & The Newborn Baby
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The Process…
A zygote is a fertilized egg (conception – 2 weeks).
Developing cells are known as an embryo (2 weeks – 8 weeks).
The cells develop, and start to look like an actual human. This is a fetus (9 weeks – birth).
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Teratogens
Harmful agents that can reach the embryo or fetus– AIDS virus
– Cigarette smoke
– Alcohol
– Drugs (illegal & OTC)
– X-rays
– Diabetes
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Fetal Alcohol Syndrome (FAS)
Physical impairment Cognitive impairment 1 in 750 infants Alcohol especially
damaging during the embryonic stage because it’s a critical period for development
Critical period – window of opportunity
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The Baby Is Born!!!
Newborns spend about 70% of their time sleeping
To study infants, psychologists show them pictures and record their eye movement, changes in heart rate, sucking rate, brain waves, body movements, and perspiration rates
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Infants Senses
Can see objects soon after birth from about 8-10 inches away
The baby can hear before it’s born
It turns its head at the sound of its mother’s voice
The most important sense to a newborn is smell
A week-old baby can smell the difference between its mother and another woman
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Sense of Touch
Sense of touch so important
Helps develop brain connections
Baby massage
Contact Comfort/ Harry Harlow
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Visual Sense
Prefer a new picture or pattern vs. an old one
Clear contrastsPictures that resemble
faces vs. ones that don’t look like faces
Depth perception: visual cliff
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Reflexes
Grasping– Babies will wrap their fists
around anything put in their hands
Rooting– If you touch a baby’s
cheek, it will turn its head Sucking
– Putting anything in a baby’s mouth, it will automatically start sucking
Stepping– Babies make stepping
motions when they are held upright with their feet touching a surface
Swallowing– Allows liquids to go down
Moro– Startling reflex… when
startled, the baby throws it arms and legs into the air, opens its fingers wide searching for its mother’s hand
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Temperament (Thomas & Chess)
Easy– Cheerful, relaxed,
predictable Slow-to-warm-up
– Cautious, but when comfortable, easy
Shy– Apprehensive of new
environments/people Difficult
– Irritable, intense, unpredictable
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HOMEWORK!!!
Your temperament is your biological predisposition. It usually doesn’t change over time.
Take a few minutes now to write out what you think your temperament is right now
Go home tonight and ask your parents, grandparents, siblings, etc. what your temperament was like as an infant
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Maturation
Natural growth or change that unfolds in a relatively fixed sequence independent of the environment
Brain develops neural networks
Don’t have memories of life earlier than 3-4
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Motor Development
Hold head upRoll overSit unsupportedCreep on all foursCrawlWalkLast two can be out of
order