Two populations that have been separated by a river are most likely to become separate species if
A) fur color is different in the two populations.
B) genes controlling ear development become different so that members of one population have much longer ears than the other.
C) genes controlling molecules on the surface of the sperm that bind with egg receptors are different in the two populations.
D) feeding habits are different in the two populations.
Answer: C
You might also like to view...
Balanced polymorphism is a type of
a. disruptive selection. b. sexual selection. c. directional selection. d. stabilizing selection. e. any of these
The probability of producing a normal child by two
parents who are carriers for an autosomal recessive disorder is a. 0%. b. 25%. c. 50%. d. 75%. e. 100%.
Match each hormone produced by the anterior pituitary gland with the ultimate effect(s) each has on other endocrine glands.
The temperature of evaporation is much higher for water than for alcohol. Without knowing more about the chemistry of alcohol, which of the following is the most logical chemical explanation for this phenomenon?
A) Ionic bonds form between alcohol molecules. These are the weakest type of bond and are easier to break than the hydrogen bonds between water molecules. B) Alcohol has a higher surface tension than water. This means that alcohol molecules can easily break away from other alcohol molecules and evaporate at a lower temperature. C) Alcohol molecules are more cohesive than water molecules. This means that as alcohol molecules evaporate, they pull other alcohol molecules into the air along with them. D) Fewer hydrogen bonds form between alcohol molecules. As a result, less heat is needed for alcohol molecules to break away from solution and enter the air.