1. Life Span Development

2. Conception  Sperm breaks down the egg wall  Sperm and egg combine together to form zygote

4. 1 Month  Embryo is formed  Embryo consists of 2 layers of cells which all organs will develop from

5. 2 Months  Size of a kidney bean  Slightly web fingers are distinctly visible as well as feet  At 40 days, the spine begins to form

6. 3 Months  Size around 3 inches  Weighs approx. 1 ounce  Fingerprints are now evident  Now considered a fetus at this point

7. 4 Months  Size around 5 inches (can fit in the average sized hand)  Weighs around 5 ounces  Skeleton begins to harden

8. 5 Months  Size approx. 10 inches if fully stretched out  Eyebrows and eyelids are visible

9. 6 Months  Weighs approx. 1 and a half pounds  Skin begins to smooth out  Baby begins to gain weight through fat

10. 7 Months  Weighs around 3 pounds  Size around 15 inches  Eyelids begin to work and baby can see light and will follow a light

11. 8 Months  Weighs around 4 ¾ pounds  Baby begins to put on fat  Lungs are well developed

12. 9 Months  Size around 19 inches  Weighs around 7 pounds  Vary in size at this stage

13. Possible Issue in the fetus  Teratogens  Chemical or viral agents which can reach the embryo or fetus and cause harm  Examples  Fetal Alcohol Syndrome  When a woman drinks heavily, the baby’s development is stalled, can lead to mental and physical deformities.  Heavy drug use

14. Competent Newborn  Rooting Reflex  Hear sounds and responds to mother  Smell of mother is also engrained

15. Genetics  Behavior genetics  Study of how genes and the environment impact your behavior  DNA  Chromosomes  Genes  Genes = our physical make up (nature)

16. Twins! Identical Twins  Develop from 1 cell and split before mitosis is supposed to occur Fraternal Twins  Develop from 2 cells which fall into the fallopian tubes.  Requires 2 sperm

18. Temperament, Hereditary, and Personality  Temperament  How easily excitable an individual is.  Difficult, slow-to-warm, Easy  Analyze this: A family is going to a new neighbors house for a house warming. Their daughter hides behind the parents when greeting the new neighbors. What type of temperament does this child have?

19. Natural Selection and Adaptation  Mutations  Animals and humans adapt to their surroundings  Humans will evolve through behavior  Natural selection and mating preference