Populations vary in the types of individuals and their reproductive success. Two species may live in the same area but in different habitats. Since there is little if any contact the possibility of successfully mating is drastically reduced. Since the breeding times of similar organisms are different there is no chance of reproductive contact. Birds, mammals, and insects have pre-mating rituals that attract the proper mate.
Geographic isolation plays an important role in species development and maintenance.
Read the following information, examine the data, line graph it, and answer the questions that follow. The population of birds has been examined for the past fifty years. The allelic frequencies for wing size was measured and recorded to determine if the population was favoring one size of wing over another. Examine the data below to determine if the population is evolving.