Physical Development

1
Physical Development
2
Prenatal

• Conception
• Zygote- one cell-multiplies 1 week
• Blastocyst- attaches to Uterus wall-implantation
  2nd week
• Embryo- 3-4 weeks
• Fetus- 5-8 weeks

3
Prenatal

• Three periods
• Germinal- first two weeks from conception to
  implantation
• Embryotic- 2-8 weeks, development of systems
• Fetal- 8 weeks until birth, ripening of the fetus

4
Prenatal

• Dominant

• Recessive

5
Prenatal

• Dominant
• Dark hair
• Normal hair
• Curly hair
• Nonred hair
• Facial dimples
• Normal hearing
• Normal vision
• Farsightedness
• Normal vision
• Type A or B blood
• Rh positive

• Recessive
• Blond hair
• Pattern baldness
• Straight hair
• Red hair
• No dimples
• Deafness
• Nearsightedness
• Albinism
• Type O blood
• Rh negative
• Color blindness

6
Prenatal

• We all carry 3-5 recessive genes
• Some make help us adapt

7
Teratogens

• Anything environmental that causes damage during
  the prenatal period
• Thalidomide
• Drugs
• Asprin
• Tobacco
• Alcohol
• Lead
• Mercury
• Infectious disease

8
Effects of Teratogens

• Germinal stage abortion
• Embryotic stage structural damage
• Fetal Stage functional damage

9
Other factors

• Nutrition
• Emotional stress
• Rh blood incompatibility
• Maternal age

10
BIRTH