Evolution: Natural Selection Part 3

Natural Selection explains how a population changes in response to its environment and those changes are called adaptations. 

• true
• false

What causes genetic variation in a population of a species?

• random mutations in genes
• bacteria 

Alleles are different forms of a gene.

• true 
• false

A gene mutation leads to different alleles of that gene which in turn leads to variations of  _________.

• a trait
• a taco
• more genes

A mutated allele could cause white fur in a squirrel instead of brown fur and brown fur is favorable for survival so that is why there aren't a lot of white squirrels around.

• true
• false

If the climate changed and the ground where brown fur squirrels live turned white with snow, what might happen over time to the brown squirrels?

• The brown squirrels would continue to populate the area
• The mutated white squirrels would probably become more popular over time and the brown could die off due to predators
• They would all live happily ever after

Genetic variation is the variety of alleles in a population. 

• true
• false

Genetic variation is necessary for natural selection and ensures that a population has a better chance of survival should the environment change.

• true 
• false

the first step that leads to a new species evolving is when an original population becomes divided by an event like a flood, eruption, earthquake and the population is completely separated from the others.

• isolation
• adaptation
• differentiation

The second step that leads to a new species evolving is when an original population that has been isolated has to adapt because of the environment changing and both could populations might gain different traits to adapt. 

• isolation
• adaptation
• differentiation