You discover a gene for the production of fur in mammals. You examine the gene regulation in the genomes of monkey, bear, zebrafish, wolf, and snake, and all of the genomes have an orthologous gene. What does analysis of the orthologous gene tell you about the function of the gene controlling the trait? Select all statements that apply.
A) The gene function is not limited to fur production.
B) The function of the gene is the same as the ancestral gene.
C) The gene arose through duplication and functions as part of a multi-gene family.
D) The gene did not arise from a common ancestor and therefore has different functions.
E) The gene may function in another process that is found in all of the species.

Which statements best describe the differences or similarities between a comparative investigation and an experimental investigation? check all that apply. experimental investigations are best for showing cause-and-effect relationships, while comparative investigations do not necessarily show this type of relationship. comparative investigations are often impractical and unrealistic, while experimental investigations are the most practical and realistic kinds of investigations. comparative investigations allow for the use of a wide range of variables but do not have a control group, while experimental investigations involve variables that can be controlled. both experimental investigations and comparative investigations are designed to answer scientific questions. both experimental investigations and comparative investigations focus on making observations rather than collecting new data.