The Relevance of Evolution by Natural Selection Part 1

____ & ____ factors in the habitat could affect the ability of individuals to reproduce under current environmental conditions and thus drive natural selection?

All abiotic (nonliving) & biotic (living) factors

Which alleles & traits in a population will always increase in frequency in future generations of the population?

Those that increase the ability to reproduce

What is required for a population to evolve by natural selection over generations?

Individuals must show ___ ___

Some individuals must ___ better than others due to genetic variation.

Beneficial genetic ___ must be transmitted to offspring

Genetic variation

Reproduce

Differences

A population of Aphids (insects) cannot evolve over generations by natural selection if all the individuals in the population are…

Genetically-identical (Clones)

Many of our ancestors cultivated starch-producing crops. Our ancestors that digested starch more efficiently consequently had more children because they possessed —

Two or more copies of the Amylase gene

Our ancestors cultivated crops that contained plant toxins (Phytotoxins). Which alleles enabled our ancestors to consume these vegetables safely?

Alleles that code for plant toxin inactivation

Fewer red blood cells

Increased breathing rate

Increased lung volume

Increased blood flow to the body’s tissue

These are example’s of what?

The Tibet populations’ adaptions to living at lower oxygen (O2) levels.