Chapter 3. Conception, Prenatal Development, and Birth. In this chapter. . . What happens during the first nine months of development? Will the baby be normal? What should parents do during pregnancy to optimize the baby’s health? What happens during the birth process? .
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Conception, Prenatal Development, and Birth
What happens during the first nine months of development?
Will the baby be normal?
What should parents do during pregnancy to optimize the baby’s health?
What happens during the birth process?
–End of first week differentiation of cells begins.
–During second week implantation occurs.
Usually normal genes are dominant over genes carrying abnormal traits
Sometimes gene for an abnormal trait is dominant
Examples—Huntington’s Disease, achondroplasia (form of dwarfism)
Recessive defects are expressed only if a child receives the same recessive abnormal gene from each parent
Examples—sickle-cell anemia, Tay-Sachs diseaseGenetic Abnormalities
Dominant Inheritance of a Disease--e.g., Huntington’s disease (brain disorder that affects ability to talk, think, move), achondroplasia (a form of dwarfism)
Recessive Inheritance of a Disease—e.g., Tay-Sachs disease (lack of enzyme to break down fatty waste in brain cells resulting in loss of motor and mental functions and eventually death), sickle cell anemia (abnormal hemoglobin that result in sickle shaped red blood cells that block small blood vessels resulting in anemia, jaundice, gallstones, pain, lung tissue damage, etc.)