OpenStax Biology Instructor Answer Guide
Biology 2e
Unit 4: Evolutionary Processes
Chapter 18: Evolution and the Origin of Species
Visual Connection Questions
1. Which is most likely to survive, offspring with 2n+1 chromosomes or offspring with 2n-1
chromosomes?
Loss of genetic material is almost always lethal, so offspring with 2n+1 chromosomes are more
likely to survive.
2. If two species eat a different diet but one of the food sources is eliminated and both species
are forced to eat the same foods, what change in the hybrid zone is most likely to occur?
Fusion is most likely to occur because the two species will interact more and similar traits in
food acquisition will be selected.
Biology 2e
Unit 4: Evolutionary Processes
Chapter 18: Evolution and the Origin of Species
Visual Connection Questions
1. Which is most likely to survive, offspring with 2n+1 chromosomes or offspring with 2n-1
chromosomes?
Loss of genetic material is almost always lethal, so offspring with 2n+1 chromosomes are more
likely to survive.
2. If two species eat a different diet but one of the food sources is eliminated and both species
are forced to eat the same foods, what change in the hybrid zone is most likely to occur?
Fusion is most likely to occur because the two species will interact more and similar traits in
food acquisition will be selected.
