Mechanisms of Evolution

Question 1

Jean Lamark

Answer 1

-Evolution occurs through the use and disuse of physical features. -features will increase by use or decrease by disuse . -these traits are then passed down to their offspring. -Through evolution happens during a life time.

Question 2

Charles Darwin

Answer 2

-Characteristics among members of a species vary. -Only individuals with the characteristics suited to the environmental will survive to reproduce. -Overtime those characteristics will increase in population.

Question 3

Process of Natural Selection

Answer 3

Process by which populations (not individuals) change in response to their environments.

Question 4

4 requirements

Answer 4

Genetic Variation Overproduction of offspring Struggle for existence Survival of the fittest.

Question 5

Genetic Variation

Answer 5

Exists in a population through… Meiosis- Genetic variation can be increased during crossing over and independent assortment. Mutations- Can be beneficial Genetic Recombination- Organisms pass on traits to offspring.

Question 6

Overpopulation/overproduction

Answer 6

-when conditions are favorable organisms tend to produce more offspring than the environment can support. -Resources are no longer abundant enough to support every individual in a population competition occurs.

Question 7

Struggle for Existence

Answer 7

-Every organism must constantly fight for limited resources and escape from predators in order to survive long enough to reproduce.

Question 8

Survival of the Fittest

Answer 8

-individuals best suited/adapted to their environment have the best chances for survival. -reproduce more often and pass those good traits on to their offspring. -increased frequency of best traits

Question 9

Fitness def

Answer 9

The ability to survive and reproduce in a particular movement.

Question 10

Selective pressure

Answer 10

The environment factor that effects an organisms ability to survive and/ or reproduce in an environment.