Artificial Selection and Breeding
People can change the average features of domesticated populations by repeatedly choosing which organisms reproduce. This lesson explains the mechanism, the need for heritable variation, and the benefits and risks of narrowing a breeding population.
Learning goals
- define the central terms precisely
- connect molecular, organismal and population evidence
- apply the ideas to unfamiliar biological cases
Core concepts
Artificial selection is human-directed differential reproduction intended to increase chosen heritable traits in later generations.
A selection criterion is the measurable feature used to decide which organisms will contribute offspring.
Heritable variation is genetic difference that can pass to offspring and therefore respond to selection.
Selective breeding is the planned mating of chosen organisms over generations to combine or strengthen desired traits.
Repeated mating among close relatives can increase homozygosity and expose harmful recessive alleles.
Genetic diversity is the variety of alleles and genotypes in a population and supports resilience to future change.
Concept map
Why these ideas matter
These concepts help scientists interpret evidence, design fair tests, communicate uncertainty, and make responsible decisions in research, health, agriculture, and environmental management.