Year 9 · Summer First Half
Biology
3 lessons from 2 units.
Unit B10 · lessons 4 to 5 of 5
Every one of your characteristics arrived from somewhere, and most of them arrived twice. This unit starts with the variation you can measure in a room full of people, works down through chromosomes and genes to the molecule the instructions are written in, follows how that structure was worked out, and ends with the question of what makes two organisms the same species at all.
Unit B11 · lesson 1 of 4
Evolution, extinction and biodiversity
B10 ended with variation and what a species is. This unit is what variation DOES over time. Which variation helps depends entirely on the conditions, and the conditions change — so populations change, some species run out of the variation they need, and the variety that is left turns out to be the thing worth protecting.
- 04Passing it on: heredityProcessA characteristic can vanish for a whole generation and then come back. What does that tell us about how it is passed on?Open this lesson
- 05What makes a speciesClassifyA great dane and a chihuahua look nothing alike, but they are one species. What is the test for being the same species?Open this lesson
- 01Variation and competitive successSystemNo two individuals in a population are identical. Most of the time that is a curiosity. When something goes wrong — a drought, a cold winter, a new predator — it becomes the most important fact about them.Open this lesson
Back to all three sciences this half term The whole KS3 Biology course