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1. GENES & EVOLUTION Genetic information
– brain and body developed according to complex chemical instructions that were written in a human cell no larger than a grain of sand
• Fertilization
• Zygote
• Chromosomes
• Chemical alphabet
• Genes and proteins
• Genome
• Genetic factors
2. Fertilization – occurs when a sperm, which contains 23 chromosomes, penetrates an egg, which contains 23 chromosomes