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Biology-Evolution > Evolution > Flashcards

Flashcards in Evolution Deck (18):
0

Microevolution

The actual processes that allow genetic diversity to occur. The actual change in genes.

1

Macroevolution

Measuring the success of the changed genes. The environmental pressures that select the fittest organisms.

2

HMS Beagle

Darwin's ship that studied bio-geographical isolation

3

Bio-geographical isolation

Diversity of life throughout the world.

4

Darwin's 5 key observations

1. Organisms within the same population have unique traits.
2. Traits are inheritable.
3. Organisms adapt.
4. Nature is cruel.
5. Differential reproduction occurs (number if offspring).

5

Evolution

Biological processes that changes the gene sequence for a trait.

6

5 different types of changes in genes

Mutations
Crossing over
Gene flow
Sexual reproduction
Genetic drift

7

What type of mutations usually cause evolution?

Missense, accumulation of many mutations

8

Crossing over

Can change phenotype and new genes

9

Gene flow

Emigration and immigration of new or different genes into a population and reproduce.

10

Sexual reproduction

Combination of egg and sperm

11

Genetic drift

Getting rid of alleles in a population, loss of individuals by chance

12

Founder effect

When a few organisms find a new place to live (recolonize), reduction in genes in population

13

Bottleneck effect

When a few individuals start a new population and decreases the genetic diversity

14

Beneficial

Both organisms benefit in the relationship

15

Competitive

Both organisms compete for survival in the relationship

16

Biotic potential

The maximum reproductive capacity of a population under optimum environmental conditions

17

Environmental resistance

Factors in an environment such as predators, climate, etc. that keeps populations from reaching their maximum growth potential