When birds from the two populations are brought together, they produce young whose appearance is intermediate between the two parents.
A) A species can be distinguished by body shape and other structural features.
Your assignment is to separate them into species. There is no accompanying information as to where or when they were collected. Which species concept will you have to use?
The peppered moth provides a well-known example of natural selection. The light-colored form of the moth was predominant in England before the Industrial Revolution. In the mid-19th century, a dark-colored form appeared. The difference is produced by a dominant allele of one gene.
When birds from the two populations are brought together, they produce young whose appearance is intermediate between the two parents.
e) Times between speciation events vary widely and depend on generation times, causes of speciation, environmental factors, and chance.