Natural Selection Flashcards
(10 cards)
What is natural selection
The process by which a population retains those genes that make it adaptable to its habitat
What is Evolution
The change in the genetic composition of a population over successive generations
What is the Charles Darwin theory/the theory of evolution by natural selection
Species change over time through the gradual accumulation of heritable traits that improve an organism’s ability to survive and reproduce in a given environment.
Why in a population many individuals do not survive
Competition for limited food and resources;
●Try to avoid predators;
●Struggle to avoid disease;
●Try to tolerate changes in the environment
What is a niche
The role an organism plays in an ecosystem
What is antibiotic resistant bacteria
Bacteria evolved to withstand the effects of antibiotics.
Why is antibiotic resistant bacteria a problem
When antibiotics are used on a population of bacteria, any bacteria with the genes to resist the drug will survive, and most of the rest will be killed. The resistant bacteria then multiply, producing populations of antibiotic-resistant bacteria
What is mutation
A mutation is a change in the amount of chromosomes, or a change in the structure of the chromosome or DNA of an organism.
What is an example of a gene mutation
Sickle Cell Anemia
What is sickle cell anemia
A mutation in the gene that affects hemoglobin
