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AQA Biology Unit 2 Questions and Answers

Variation

1) What is intraspecific variation?
Variation within the same species

2) What is interspecific variation?
Variation within different species

3) What is intraspecific variation caused by?
Genetic and environmental factors

4) What do all members of the same species have?
The same…

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You would divide the field into a grid and use a random number generator to choose a
coordinate
DNA

1) What is the monomer of DNA?
Nucleotides

2) What are nucleotides made up of?
Deoxyribose sugar, phosphate group and nitrogenous base

3) What elements do nucleotides contain?
Carbon, oxygen, nitrogen,…

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Genetic Diversity

1) How is genetic diversity within a population increased?
Mutations in DNA and different alleles being introduced when individuals from another
population migrate into them and reproduce (GENE FLOW)

2) What is a genetic bottleneck?
An event that causes a big reduction in population, therefore reducing the number…

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It has lots of branches which means that it can be broken down into glucose more easily so
energy is released more quickly and it is compact.



5) What is cellulose made up of?
Long, unbranched chains of beta glucose. Strands are linked together by hydrogen bonds
which forms fibres…

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2) What is an organ?
A group of physically linked different tissues working together as a functional unit


3) What is a system?
A group of organs working together to carry out a complex function

4) How are squamous epithelium cells adapted for their function?
Thin with not much cytoplasm.…

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By looking at the order of the bases. Closely related species will have a higher percentage of
similarity in their DNA base order



10) How does DNA hybridisation work?
DNA collected from 2 species, separated into single strands and mixed together
Where the base sequences of the DNA are the…

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