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What is a species?
A species is a group of living organisms who are so similar to each other that they are able to interbreed and produce fertile offspring
What are the two types of variation?
Continuous and discontinuous
Define continuous variation and give an example
- Continuous variation is when a characteristic varies from one extreme to another in a smooth, continuous way.
- Examples: height, weight and pulse rate
Define discontinous variation and give an example
- Discontinous variation is when a characteristic can be divided into two or more distinct groups.
- Examples: eye colour, blood groups and fingerprint types
How can continuous variation be shown?
On a histogram or a line graph
How can discontinuous variation be shown?
On a bar graph or a pie chart
Sex cells are called ______?
What are the tiny units along chromosomes called?
Genes can either be......?
dominant of recessive
What is an organisms genotype?
The set of genes an organism possesses
What is an organisms phenotype?
What an organism actually looks like
If a child is female what set of chromosomes will it have?
If a child is male what set of chromosomes will it have?
What are different forms of a gene called?
What is the normal phenotype ratio in the F2 generation?
3 : 1
Why is the real ratio often different from the predicted ratio?
As fertilisation is a random process
What is a mutation?
A change in the chemical structure of a gene or chromosome
What can be used to detect chromosome mutations in an embyo?
What factors can increase muations?
- Radiation (X-rays, Ultraviolet light)
- Mutagens eg tobacco
When an organism possess two identical forms of a gene it is said to be _________?
When an organism possess two different forms of a gene it is said to be ________?
In selective breeding organisms with ______ ______ are bred together?
Give an example of selective breeding
- Cereal crops being bred to be more resistant to disease
- Cows being bred to produce more milk
- Sheep being bred to produce more wool
What would you like to do?
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