Inheritance and Traits
3rd Grade Science · 4 lessons
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Lessons
- 1Genes and TraitsGenes are segments of DNA that code for specific traits like eye color, hair texture, and blood type. Humans have approximately 20,000 genes spread across 23 pairs of chromosomes.Experiment
- 2Natural SelectionNatural selection is the process where organisms with traits better suited to their environment survive and reproduce more successfully. Over time, this drives evolution.Lesson
- 3Types of AdaptationsAdaptations develop over many generations through natural selection. Structural adaptations (like thick fur), behavioral adaptations (like migration), and physiological adaptations (like venom production) all help survival.Lesson
- 4The Fossil RecordThe fossil record provides evidence for evolution by showing how organisms have changed over time. Transitional fossils show features of both ancestral and descendant species.Lesson