To be preserved as fossils, what happens to the remains of organisms?

The _____ divided Earth's history into units that reflect major changes in the Earth and its life forms.

What do molecular clocks use to estimate relatedness among species?

The fewer the molecular differences are between two species, the more closely related they are.

Relative dating and absolute dating both help to date fossils. However, which can approximate an exact age of a fossil in years?

This table shows DNA sequence comparisons for some hypothetical species. Based on the data, which species share the most recent common ancestor to Species A?

What kind of scientist find and studies fossils to understand the past?

What do fossils reveal about the evolution of the horse?

What can fossil evidence tell us about the evolution of whales?

In Darwin's theory of evolution, he reasoned that species _____.

Variations of individuals within a species increases the chance that some will survive environmental changes.

An organism's relative ability to survive and produce fertile offspring is known as _____.

In the example of the white and brown mice, vultures prey on the mice. However, in the desert environment, the brown mice are better able to hide from their predators and have an advantageous trait. What happens to the color of mice over time?

Tortoises and mollusks are not closely related. Tortoise shells and mollusk shells are therefore an example of _____.

Which structures are found in all early vertebrate embryos?

Structures that are structurally similar but have different functions in related organisms are called _____.

Which of the following provides the strongest evidence of evolutionary relationships?

There are many examples to show that evolution occurs. What is Evolution?

A gene pool contains all of the genetic variation necessary for a population.

A population is made up of organisms of the SAME species that live in an area, and remember that the genes of an individual DON'T evolve. So with that knowledge, what unit do they need to use for evolution?

In many cases like with Darwin's Finches, we see that evolution occurred in a relatively short period of time. What do we call this?

The genes of an individual do not change over time.

There are 4 forces of Evolution. Which one of these is NOT one of the 4 forces.

There are 4 forces of Evolution. Which one of the forces is how all new alleles (gene options) first show up?

There are 4 forces of Evolution. Which one of the forces would represent this example: Because of the Vietnam war, some American men fathered children with Vietnamese women thus adding new alleles to the gene pool in that area.

Genetic Drift is random changes in allele frequencies due to small populations. An example used was that the Amish have a much higher % of people with a syndrome that adds a 6th finger than non-Amish populations. This impact where we see a small population stay isolated and pass on an allele at higher frequencies is known as what?

The gene pool is made up of traits impacted by the environment, mutations, recombination, and fertilization. In the video, they show that when you plot the data of a trait type vs the number of individuals with that trait you will see the most common ones appear. What shape graph does it create?

What is natural selection?

Sickle Cell Anemia is a harmful mutation to your red blood cells. According to the chart and table in the reading, then why is it still in the population if it's bad?

If researchers were looking into what color of tulip flowers have evolved the best over time and they wanted to start with the PHENOTYPE of the tulips, what would they be studying?

Natural Selection can affect what populations look like for a trait (phenotypes) in the 3 ways below. Which is this story an example of? After black soot from factories covered trees, the common light pepper color moths that landed on those trees were easily seen and eaten by birds. This shifted the population to being made up more of the black colored moth because they stayed alive long enough to reproduce and pass on the dark gene. This is an example of:

Natural Selection can affect what populations look like for a trait (phenotypes) in 3 ways. Which is this story an example of? A baby's weight at birth has an optimal range for survival. If the baby is too small it may struggle to survive. If the baby is too large it may not survive delivery. So an optimal middle range has evolved. This is an example of:

What is the process by which new species evolve called?

According to the reading, how can a river influence the formation of a new species of mice?

The example of the American Toad and the Fowler's Toad mate at different times of the year, they are on their way to becoming different species. Which is this an example of?

A horse can mate with a donkey, BUT the baby they make can never have babies of its own (it is sterile). This means that horses and donkeys are now considered 2 separate species. What do we call the offspring (baby) of a horse and a donkey?