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Human Development Cells-basic unit of life. Body system-group of organs that work together to carry out related tasks. Digestive system Endocrine system Development After Fertilization Fertilized cell divides Embryo-first eight weeks of pregnancy. Fetus-eight weeks to birth. Cells development into tissues, organs and body systems. Pregnancy last 9 months Fetus receives nutrients and oxygen from the umbilical cord. Care During Pregnancy Do’s Eat healthy Vegetables Protein Calcium Get regular check-ups The closer to the pregnancy the more you visit the doctor. Care During Pregnancy Beware of infections Flu Colds Fifths disease Chicken pox Care During Pregnancy Don’t Smoke or use tobacco Baby is more likely to have allergies, asthma and respiratory infections. Drink alcohol Baby is more likely to develop physical and mental problems (fetal alcohol syndrome). Baby is more likely do die of SIDS Care During Pregnancy Take any unnecessary drugs, legal or illegal Any drug mom takes the baby also takes. Heredity Heredity-traits you get from your parents. Chromosomes-threadlike structures that carry the codes for inherited traits All human cells contain 46 chromosomes, or 23 pairs. Genes-basic unit of heredity. Sperm and egg have 23 chromosomes each. Chromosomes in sperm determine sex of the baby. Heredity Eggs contain an X (female) chromosome. Sperm contain either an X or Y (male) chromosome. XX chromosome combo produces a female. XY chromosome combo produces a male. Downs Syndrome-genetic disorder in which a person’s cells have 47 chromosomes instead of 46.