Outline how bacteria become resistant to antibiotics as an example of natural selection
1 Answer Explain how selection, the founder effect and genetic drift, including the bottleneck effect, may affect allele frequencies in populations
1 Answer Explain how environmental factors can act as stabilising, disruptive and directional forces of natural selection
1 Answer How does natural selection lead to adaptation in populations?
1 Answer Explain that natural selection occurs because populations have the capacity to produce many offspring that compete for resources; in the ‘struggle for existence’, individuals that are best adapted are most likely to survive to reproduce and pass on their alleles to the next generation
1 Answer Use the t-test to compare the means of two different samples (the formula for the t-test will be provided, as shown in the Mathematical requirements)
1 Answer Explain the genetic basis of discontinuous variation and continuous variation
1 Answer Explain what is meant by discontinuous variation and continuous variation
1 Answer Explain, with examples, that phenotypic variation is due to genetic factors or environmental factors or a combination of genetic and environmental factors
1 Answer Explain how gibberellin activates genes by causing the breakdown of DELLA protein repressors, which normally inhibit factors that promote transcription
1 Answer 
BNO Team
BNO Team
BNO Team
BNO Team
BNO Team
BNO Team
Sourav Pan
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