Evoltuion Of Populations Flashcards
In natural selection, each organism’s traits affect its fitness when…
Compared to other individuals
What is a population?
A group of individuals of same species that live the same area/time and interbreed, producing fertile offspring
Evolution occurs in…
Populations
Evolution is simply a change in…
Allele frequencies in a population over time
Phenotype variation reflects genetic variation among…
Individuals
What is genetic variation ?
Differences among individuals in composition of their genes or other DNA sequences
Genetic variation can…
Lead to distinct phenotypes
Can be determines by a single gene
Can be determined by multiple genes
Mutations can result in…
The formation of new alleles
What is a mutation?
Change in the nucleotide sequence of organism’s DNA
What causes mutations?
Alteration of single base units in DNA
Deletion, insertion, or rearrangement of entire genes and chromosomes
Mutations results…
In a variant form that can be transmitted to offspring (heritable)
What is a point mutation?
Is when a single nucleotide base is switched, added or deleted
A point mutation can result in…
Frameshift mutations
Most mutations are…
Bad
Natural selection acts on…
Variations caused by random events like mutations
