Consider a population of crickets in which the A and a alleles at a single locus control the shape of the male and female reproductive organs. Males that are AA can only mate with females that are aa, and vice versa. Heterozygous individuals can mate with either homozygous group. After many generations of selection, the two alleles will reach a ______ equilibrium due to _______ frequency dependent selection.
a. balanced, negative
b. unstable, positive
c. unstable, negative
d. stable, directional
e. stable, negative
Question: Distinguish between morphological, phylogenetic, and biological species concepts. What are the advantages and disadvantages of each?