Year 8 - Science
Reproduction and variation
Variation (differences within species)
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This pupil-friendly study guide includes a unit summary, clear notes, common mistakes, and quick questions with answers.
Unit Summary
This unit examines variation within species, both continuous and discontinuous, using measurements and graphical representations. It also emphasises objectivity, accuracy, precision, and repeatability in investigations, the use of appropriate techniques, and the effective presentation of data.
Lesson Summary
You will learn to explain why offspring look similar but not identical to their parents and one another.
Key Notes
- When organisms reproduce they make offspring of the same kind (species resemblance)
- Offspring inherit features from both parents, so they look similar to their parents and one another (family resemblance)
- Some features are inherited when DNA is passed from parents to offspring during reproduction
- Some features are caused (or changed) by an organism's lifestyle and environment
- There is usually variation between offspring; they are not usually identical to their parents or one another
Vocabulary To Learn
- reproduction: the process that creates new individuals of a species
- inherit: to pass on features from parent to offspring
- DNA: the molecule that stores genetic information
- variation: differences between individuals within a species
Common Mistakes To Avoid
- Boys only inherit features from their father and girls only inherit features from their mother. All characteristics are caused by genes.
3 Quick Questions (With Answers)
1. Explain the scientific idea in this lesson using two key points.
When organisms reproduce they make offspring of the same kind (species resemblance). Offspring inherit features from both parents, so they look similar to their parents and one another (family resemblance).
2. Define this scientific word and use it in context. 'reproduction'
the process that creates new individuals of a species. Include the word in a full scientific explanation, not as a single label.
3. Correct this common scientific misunderstanding.
Mistake: Boys only inherit features from their father and girls only inherit features from their mother. All characteristics are caused by genes. Correction: The lesson consolidates understanding from Y7 that offspring inherit characteristics from both parents, and that some characteristics are caused (or changed) by an organism's lifestyle and environment.
More Lessons In This Unit
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