In the Figure Below (Left), Two Populations of One Species

question 12

Multiple Choice

In the figure below (left) , two populations of one species of fruit flies are raised for several generations on different nutrients (starch and maltose) . On the right, the members of the two populations were reintroduced and the mating frequencies of flies from the two different populations were recorded.
Which of the following is true?

• A) After only a few generations, these two populations have undergone speciation since they no longer mate with each other at high levels.
• B) The two populations are in the early stages of reproductive isolation since male flies are more likely to mate with female flies that were raised on the same medium.
• C) Fruit flies grown on starch for several generations are no longer capable of consuming maltose.
• D) The original population of fruit flies actually consisted of two different species of fruit flies. When hybridization occurred between the two populations, only sterile offspring were produced.