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Sixth Grade - Science Third 6 weeks ____________________________________________________________________ Key Understandings: Unit 5 – Levels of Organization in Living Systems Systems are made of different parts. The cells is the basic unit of life in organisms Structure determines function Systems can be combined to serve a function Each level of organization has a set of functions that serve the organization There are different levels or organization within an organism. VOCABULARY 1. Function – purpose 2. Structure – the way something is put together Unit 6 - Genes Within the nucleus of a cell, chromosomes composed of DNA contain al genetic information which determines the inherited traits passed from parents to offspring. Genes that are composed of DNA can be dominant or recessive and determine traits. Changes in genetic or inherited traits can occur over several generations through natural occurrence and selective breeding. VOCABULARY 1. Evolution – theory, based on scientific evidence that describes how organisms change over many generations