Exam 3 Flashcards
Lamarckianism
traits acquired during the lifetime of an individual were passed onto offspring
Darwinism
natural selection or genetically based variation leads to evolutionary change
-there is natural variation in a population
evolution
the change in allele frequencies over time
- descent with modification
- traits vary among individuals
How does resistance evolve?
mutation and gene transfer
mutation
variant of a gene
-creates new genetic diversity by creating new alleles
gene transfer
new alleles are ‘transferred’ by bacteria
population
a group of organisms of the SAME species that live together in the same geographic location
fitness
“how well an individual does”
-survival and reproduction, resulting in offspring
If the bacterial phenotype is antibiotic-sensitive, then the reproductive fitness of that bacteria is . . .
LOW
If the bacterial phenotype is moderately antibiotic-resistant, then the reproductive fitness of that bacteria is . . .
MEDIUM
If the bacterial phenotype is highly antibiotic-resistant, then the reproductive fitness of that bacteria is . . .
HIGH
How do populations evolve?
When a trait is favored over others, then the ALLELE that codes for those traits increases frequency over time
