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____ & ____ 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.