Evolution

What is a change in allele frequency in a population over time?

• evolution

• natural selection

• gene pool

• allele frequency

Evolution means creating a new species.

• False

• True

Answer explanation

Evolution does not HAVE to lead to a new species forming.

Which of these pressures could drive evolution?

• Resource availability

• Environmental conditions

• Biological factors

Answer explanation

All of these pressure can and do drive evolution to occur!

The more similar two species' DNA is...

• The more closely related they are

• The more distantly related they are

Human and chimpanzee DNA is about 99% similar. This means...

• We evolved from chimpanzees

• Chimpanzees evolved from us

• We share a common ancestor

Answer explanation

Humans and chimpanzees are more like "cousins" in the tree of life.

What do Hox genes do?

• Tell our cells how to make body parts

• Tell our cells where to make body parts

What does this image suggest?

• All animals started out as aliens

• These animals share a common ancestor

• These animals do not share a common ancestor

Answer explanation

Since these animals all look extremely similar in the early stages of development, this suggests that we share a common ancestor!

These structures have different functions, but have similar internal structure.

• Homologous structures

• Analogous structures

• Vestigial structures

The structures have similar functions, but different internal structure.

• Analogous structures

• Homologous structures

• Vestigial structures

These structures no longer serve a purpose.

• Vestigial structures

• Homologous structures

• Analogous structures

Answer explanation

These structures once served a purpose (for the organism's ancestor).