7.8 Continuing Evolution Flashcards
Why does life evolve?
Because environments change
List three mechanisms of genetic change.
Changes in DNA (mutations)
Cell division (crossing over, independent assortment, and sexual reproduction)
Environmental disruptions (changes in allele/gene frequencies within a population
What do transitional fossils show us?
The evolutionary changes as one group evolves into another
Why does resistance to chemicals evolve?
Mutations can result in resistance
Resistant organisms can be selected for under advantageous conditions
Frequency of resistance can increase within a population overtime if the trait continues to provide better fitness
What is a pathogen?
An infectious agent that can produce a disease
What can pathogens do?
They can be compatible with their host, leading to coevolution between them
