U7: Topic 1, 2, and 3 Check UP

Front

What factors would increase the frequency of a genotype in a population over time?

Back

Selective pressures that make the trait favorable.

Front

Why would the presence of a particular genotype or phenotype decrease in a population over time?

Back

Changes in the environment that now make the trait less favorable.

Front

What does the term 'variation' mean?

Back

The different ways that traits are expressed in a population.

Front

What does it mean for an organism to have greater fitness?

Back

It leaves more viable offspring than others of its species.

Front

What is genetic drift?

Back

A mechanism of evolution that refers to random changes in allele frequencies in a population.

Front

What is the role of mutations in evolution?

Back

Mutations introduce new genetic variations that can be acted upon by natural selection.

Front

What is reproductive isolation?

Back

A mechanism that prevents different species from interbreeding and producing fertile offspring.

Front

What is natural selection?

Back

The process by which organisms better adapted to their environment tend to survive and produce more offspring.

Front

What is gene flow?

Back

The transfer of genetic material between populations, which can affect allele frequencies.

Front

What is a common ancestor?

Back

An ancestral species from which two or more species have evolved.