Evolution Part 2

• Stabilizing Selection

• Directional Selection

• Disruptive Selection

• Stabilizing Selection

• Directional Selection

• Disruptive Selection

• Directional Selection

• Stabilizing Selection

• Disruptive Selection

Label the natural selection graphs correctly...

• 1 Stabilizing, 2 Directional, 3 Disruptive

• 1 Disruptive, 2 Stabilizing, 3 Directional

• 1 Directional, 2 Stabilizing, 3 Disruptive

All of the genetic information found in a population.

• population

• genetic drift

• evolution

• gene pool

Which of the following is an example of the founder effect?

• Humans choose two dogs they like the characteristics of and breed them together.

• Affected individuals with blue skin can trace their ancestry back to one of the first settlers in the region.

• The environment of a fox population changes and over time foxes who are white survive and pass on their genes to their offspring.

• Cheetah populations reach their lowest levels with reduced diversity and as they rebound are so genetically similar they appear to be inbred.

A change in the genetic composition of a population as a result of descending from a small number of colonizing individuals is called:

• founder effect
• bottleneck
• genetic drift
• gene flow

Which form of genetic drift will change the frequency of alleles in a population?

• Founder's Effect

• Bottleneck Effect

• Neither

• Both

In a population of Hawaiian honeycreeper birds, some individuals have short beaks and some have long beaks. The long beaks are better for eating fruit, and the short beaks are better for eating nuts. After a very wet winter, there is an abundance of fruit in a certain Hawaiian ecosystem. What is your prediction?

• Impossible to predict.

• Both types will flourish.

• The short-beaked allele will increase, and the long-beaked allele will decrease.

• The long-beaked allele will increase, and the short-beaked allele will decrease.

In a population of Hawaiian monk seals, some have thick fur and some have thin fur. In the next 100 years, the temperature of the ocean is predicted to increase by several degrees. What is your prediction?

• Both thick-fur and thin-fur alleles will persist equally in the population.

• Thin-fur alleles will increase in the population; thick-fur alleles will decrease in the population.

• Thick-fur alleles will increase in the population; thin-fur alleles will decrease in the population.

• The population will collapse.