In the Womb: -GAMETES (reproductive cells) fuse to create ZYGOTE -Monozygotic v.
twints (Identical v. Fraternal) -Infertility: Inability to conceive after 18 months
trying. -Genotype: Underlying genetic material Homozygous- Alleles that contain
information from each parent Heterozygous- Alleles that contain different
from each parent -Phenotype: Physical manifestation of your genetic inheritance
Development Deviates-- Causes: Genetics, Spontaneous Mutation, Environmental Insult
Consequences: Down Syndrome (Trysomy 21), Sickle-Cell Anemia, Tay-Sachs Disease,
Fragile-X Syndrome. Interaction of Heredity and Environment-- Multifactorial
Transmission- Nature AND Nurture Intelligence- Closer genetic link leads to more
IQs, Closer in age with sibling leads to higher correlation with IQs. Culture,
Encouragement, Educational, Social Involvement Sandra Scarr- Gene-environmental
influence -Passive (usually newborns) -Active (toddlerhood and up) -Evocative
(todlerhood and up) Prenatal Growth and Change: Conception- 100 mil. sperm produced
400,000 ovum at birth, mature at puberty Ovum + Sperm = Zygote Germinal Stage:
fertalization --> 2 weeks Blastocyst travels and implants in uterus. Embryonic
weeks --> 8 weeks Embryo firmly secures to uterus. Development of major organs and
Ectoderm (skin, hair, teeth). Endoderm (internal systems). Mesoderm (muscle, bone,
blood/circulation). Fetal Stage: 8 weeks --> Birth Fetus develops rapidly... Organs
working. Brain becomes more sophisticated. 38.5 weeks- full term. Sleep and
Hear and feel vibrations. 8-24 weeks, hormones result in gender differentiation.
Viability: Age at which a baby can survive outside of womb. Pregnancy Problems:
Miscarriage (15-20% of pregnancies. Mostly before 12 week mark), Abortion.
threat to prenatal development such as.. -Environmental Toxins -Smok