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Transcript
The modern synthesis Part I Heritable variations Some variations in parents are passed to offspring: One of the key assumptions of the theory of natural selection. How does that work? Genes! Genes: Where are they? Genes are found in the nuclei of almost all cells: Genes: Where are they? They are packaged in chromosomes: Humans have 23 pairs of chromosomes: Genes: Packaging This packaging is very complex: Chromatin structures. DNA Each chromosome contains a huge molecule called DNA: A small fragment of DNA. Genes and DNA Genes are small pieces of DNA: The chemical structure of DNA Genes are sequences of nucleotide pairs (base pairs): A sequence of nucleotides along the DNA backbone. What do genes do? They code for specific proteins: Gene summary
