Females of the species drosophila pseudoobscura respond less well to the courtship signals from males of their close relative drosophila persimilis than they do to those of males of their own species. this is an example of [a] gametic isolation. [b] hybrid infertility. [c] behavioral isolation. [d] adaptive radiation. [e] sympatric speciation.

The answer is reproductive isolation. This ensures that there is no viable reproduction between different species or subspecies. Even if reproduction between species leads to conception, the embryo may not be able to survive to maturity or will be sterile. This ensures that species remain integral by restricting gene flow.

the three components of a nucleotide are the nitrogenous base, the phosphate group and the five-carbon sugar.