A Level AQA Biology: Unit 7 (Genetics, populations, evolution and ecosystems)

3.7 Genetics, populations, evolution and ecosystems

3.7.1 Inheritance

What is genotype?

What is phenotype?

What is an allele?

What are the types of allele?

How can the pairs of alleles be expressed?

How can co-dominant alleles be expressed?

What are monohybrid crosses?

Inheritance table for a monohybrid cross

What are dihybrid crosses? FINISH

Inheritance table for a dihybrid cross

What is sex-linkage?

Inheritance table for a monohybrid cross with sex-linked genes

What is autosomal linkage?

Inheritance table for a dihybrid cross with autosomally linked alleles

What are multiple alleles?

Inheritance table for a monohybrid cross with multiple alleles

What is epistasis?

Inheritance table for a monohybrid cross with epistasis

What is the chi-squared (X^2) test?

3.7.2 Populations

What is a species?

What is a population?

What is the gene pool?

What is allelic frequency?

What is the Hardy-Weinberg principle?

How can the Hardy-Weinberg principle be used?

3.7.3 Evolution may lead to speciation

Why may individuals in a population show a wide range of variations in phenotype?

What are the causes of variation in genetic factors?

What factors cause differential survival of organisms in a population?

What is the influence of differential survival of organisms in a population?

How does natural selection influence allelic frequency?

What is stabilising selection?

Graph of stabilising selection

What is directional selection?

Graph of directional selection

What is disruptive selection?

Graph of disruptive selection

What is the influence of allelic frequency on evolution?

What is speciation?

What is allopatric speciation?

What is sympatric speciation?

What is genetic drift?

3.7.4 Populations in ecosystems

What is a community?

What is an ecosystem?

What are some examples of abiotic factors?

What are some examples of biotic factors?

What is a niche?

What is the carrying capacity of an ecosystem?

What is intraspecific competition?

What is interspecific competition?

How can predation influence population size?

How can the size of a population be estimated?

How can quadrats be used to estimate the size of a population?

How can the mark-release-recapture method be used to estimate the size of a population?

What kind of system are ecosystems?

What is succession?

What are the stages in succession?

What are some common features of succession?

How can organisms influence their environment?

What is secondary succession?

How does succession progress in a woodland?

How does succession influence conservation efforts?

What are some human needs of natural resources?

What are the reasons for conservation?

What are some conservation efforts to maintain sustainability of resources?

How can human needs conflict with conservation efforts to maintain sustainability of resources?