Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
11 Cards in this Set
- Front
- Back
- 3rd side (hint)
|
Biological evolution |
Refers to the evolution of life. May be defined as descent with modification |
|
|
|
Species |
A distinct lineage of organisms consisting of a group interbreeding populations that are usually reproductively isolated from other such groups. |
|
|
|
Population |
A group of geographically delimited individuals of the same species that typically have significant amount of gene transfer |
|
|
|
Descent with modification |
The transfer of genetic material enclosed within a cell from parent to offspring. |
Mother to child |
|
|
Modes of descent |
Can either be via asexual or sexual reproduction |
|
|
|
Descent through time |
This will result in a lineage or clade |
|
|
|
Modification |
Refers to the change in genetic material transferred from parent to offspring such that the genetic material of the offspring is different from that of the parent |
|
|
|
How does modification occur |
Occurs via mutation (direct alteration of DNA) Also through generic recombination Therefore the genetic make-up of sexually reproductive population and species will always change overtime. |
|
|
|
What two mechanisms drive evolution overtime? |
Genetic drift- random genetic modification Natural selection- non random genetic modification |
|
|
|
What is natural selection |
This is the unequal contribution of genetic material from one generation to the next It acts on the phenotype (observable characteristics of an organism) |
|
|
|
What results from natural selection? |
Adaptation -(a feature that performs a particular function that improves the chances of survival) Speciation- the formation of new species from preexisting species. This follows lineage divergence |
|
