Evolution

Question 1

Darwins Observations and Inferences

Answer 1

O1) There is variation between individuals
O2) Some of the varation is heritable
I1) Variations may affect survivability.
O3) Organisms produce more offspring than survive to reproduce.
O4) Most populations are relatively stable in size.
O5) Resources are limited.
I2) Unequal ability to survive and reproduce leads to accumulation of favourable traits.
O6) Organisms generally suit their environment.

Question 2

Selective Agent

Answer 2

Component of the natural environment that consistently causes differential survival and/or reproduction.

Question 3

Selective Pressure

Answer 3

Intensity with which the selective agent acts on the population to evolve.