Question

1. which term defines the process that leads to the formation of reproductively isolated species from a single ancestral population? a. reproductive divergence b. speciation c. genetic isolation d. environmental adaptation 11. what does genetic variation contribute to within a species? a. uniformity in traits b. diversity among individuals c. increased susceptibility to diseases d. decreased adaptability to environments 12. which scenario represents allopatric speciation? a. two bird populations with different mating calls in neighboring areas b. plants preferring different pollinators within the same area c. a group of rodents isolated on an island due to a geographic barrier d. two fish groups living in shallow and deep waters of a river

Explanation:

1. Speciation is the process by which new reproductively - isolated species form from a single ancestral population. Reproductive divergence is part of the process but not the overall term. Genetic isolation is a factor in speciation but not the defining process. Environmental adaptation can contribute to speciation but is not the process itself.
2. Genetic variation leads to differences in traits among individuals within a species, thus contributing to diversity. It does not lead to uniformity, nor does it generally cause increased susceptibility to diseases or decreased adaptability.
3. Allopatric speciation occurs when a population is separated by a geographic barrier. In option c, the rodents on the island are isolated by a geographic barrier. Option a is an example of sympatric speciation due to behavioral differences. Option b is also sympatric speciation related to pollinator preference. Option d may be a form of micro - speciation within a river but is not a clear case of allopatric speciation due to the lack of a major geographic barrier separating the two fish groups.

Answer:

1. B. Speciation
2. B. Diversity among individuals
3. C. A group of rodents isolated on an island due to a geographic barrier