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Key Stage 3 Science

QuestionAnswer
Define the key word: Environmental variation Differences between organisms caused by environmental factors
List some examples of inherited variation Eye colour, natural hair colour, natural skin colour, blood group
Where in a cell is the genetic information found Nucleus
How many chromosomes do you find in a human cell? 46
How many chromosomes do you find in a sperm and egg cell 23
A section of DNA is called a ______ Gene
Outline the main steps of the DNA extraction practical 1. Crushing 2. add dertergent and salt 3. Heat 4. Filter 5. Add ethanol
Define biodiversity The range of different species of organisms in an area
State two methods of preservation for extinction and endangered species Breeding programmes and gene banks
Define evolution A change in one or more characteristics of a population over a long period of time
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