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Life Span Development

Life Span Development. Conception. Sperm breaks down the egg wall Sperm and egg combine together to form zygote. 1 Month. Embryo is formed Embryo consists of 2 layers of cells which all organs will develop from. 2 Months. Size of a kidney bean

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Life Span Development

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  1. Life Span Development

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

  3. 1 Month • Embryo is formed • Embryo consists of 2 layers of cells which all organs will develop from

  4. 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

  5. 3Months • Size around 3 inches • Weighs approx. 1 ounce • Fingerprints are now evident • Now considered a fetus at this point

  6. 4 Months • Size around 5 inches (can fit in the average sized hand) • Weighs around 5 ounces • Skeleton begins to harden

  7. 5 Months • Size approx. 10 inches if fully stretched out • Eyebrows and eyelids are visible

  8. 6 Months • Weighs approx. 1 and a half pounds • Skin begins to smooth out • Baby begins to gain weight through fat

  9. 7 Months • Weighs around 3 pounds • Size around 15 inches • Eyelids begin to work and baby can see light and will follow a light

  10. 8Months • Weighs around 4 ¾ pounds • Baby begins to put on fat • Lungs are well developed

  11. 9 Months • Size around 19 inches • Weighs around 7 pounds • Vary in size at this stage

  12. 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

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

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

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

  16. 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?

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

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