Hardy-Weinberg Equation Hardy-Weinberg Principle The Hardy-Weinberg principle states that if certain conditions are met, the allele frequencies of a gene within a population will not change from on...
Natural Selection can lead to Adaptation & Evolution Variation exists within a species population Variation refers to the differences between individuals. It can be interspecific (between diffe...
Ecological Niches & Adaptations Niche The place where a species lives within an ecosystem is its habitat The role that a species plays within its habitat is known as its niche, including: The b...
Comparing Biodiversity Between Habitats Once the abundance of different species in an area has been recorded, the results can be used to calculate the species diversity for that area Species divers...
Measuring Biodiversity Within a Habitat The place where an organism lives is called its habitat Habitats can vary in size, with some being very large (e.g. grasslands) while others are very small (...
Biodiversity & Endemism Biodiversity can be thought of as a study of all the variation that exists within and between all forms of life Biodiversity looks at the range and variety of genes, spe...
Phenotypes The observable characteristics of an organism are its phenotype Phenotypic variation is the difference in phenotypes between organisms of the same species In some cases, phenotypic varia...
Epigenetics An organism’s internal or external environment can influence gene expression patterns The levels of regulatory proteins or transcription factors can be affected in response to environme...
Cell Differentiation Stem cells become specialised through differential gene expression This means that only certain genes in the DNA of the stem cell are activated and get expressed Every nucleus ...
