Exam 32: Evolution and Our Heritage

Match each definition to the correct term -Sugar gliders from Australia and flying squirrels from North America are not closely related mammals, but they do resemble one another in appearance and locomotion. This would illustrate the phenomenon of ________.

You, as a cell biologist, discover that there is strong evidence that chloroplasts, found in plant and algal cells, are descended from bacteria but not eukaryotes. What theory would explain this finding?

Which of the following is most likely to be the source of most of the oxygen in the atmosphere?

The adult human jawbone, or mandible, arises embryonically from a gill arch. The arch and the mandible are said to be ________.

If you hear a friend call someone a "Neanderthal," why might it conceivably be a compliment?

The Abuja family had 10 children by 1950, but because of ill health, there is now only one surviving grandchild. The Bacchus family had three children in 1950 and now has six grandchildren. Which statement about these families is correct?

A(n) ________ is a group of individuals of the same species that live in a particular area.

Imagine that you are an archaeologist on a dig somewhere on an East Asian island and than you begin to excavate an area littered with stone tools that also has the remains of an ancient fire. Subsequent carbon dating of the charcoal from the fire yields a date of 100,000 years before the present. Given these circumstances, which species would you expect most likely set that fire?

________ occurs when allele frequencies within a population change randomly because of chance alone.

Which of the following is one method in which a change in the DNA leads to genetic changes in a population?

DDT was first used as an insecticide in 1942. Resistance genes existed before this time in houseflies and other insects. By 1970, no farmer would bother using this chemical. Why?

The order of mammals to which humans belong is the ________.

What factors contribute to genetic variation in populations?

Which of the following groups has the most species?

Match each definition to the correct term -These slender, or gracile, australopithecines are found later in the fossil record than A. afarensis.

Changes that occur at the genetic level in populations are classified as ________.

Astronomers have detected the presence of various chemicals in deep space similar to those thought to have been synthesized in Earth's early atmosphere. The environments where those deep space molecules originated would be most likely to contain ________.

A set of regulator genes is known to be very similar in both humans and flies. This fact is used to indicate what about the two species?

Today's atmosphere on Earth is made up of nitrogen, oxygen, carbon dioxide, and water. According to all models, which of these was largely absent 3.8 billion years ago?

________ can behave as an enzyme and may have been the first macromolecule leading to the first cells.