Mississippi Science BIO.4.6
The Standard
- BIO.4
- Students will analyze and interpret evidence to explain the unity and diversity of life.
Construct explanations for the mechanisms of speciation (e.g., geographic, and reproductive isolation).
2026 Mississippi College- and Career-Readiness Standards for Science · Adaptations and Evolution
Teacher's field guide
What This Standard Means
What Students Need to Do
- Explain how a physical barrier or a mating barrier stops genes from mixing between populations. Describe how inherited differences can build over generations until the populations cannot produce fertile offspring together.
What Mastery Looks Like
- Given a river splitting a lizard population, students can explain how blocked gene flow could lead to reproductive isolation. They can name evidence to check if the groups meet again, such as whether their offspring are fertile.
Common Misconceptions
- A river does not create two species overnight. Different colors alone do not prove two populations cannot interbreed. Animals do not choose to change their inherited traits.
How to Assess It
- Exit ticket: A river splits one frog population for many generations. Explain how the groups could become separate species, and name one thing you would check if they met again.
Lesson moves
Ways to Teach It
Split mixed beads into two cups, draw and duplicate one random bead in each cup for five rounds, then compare the colors.
Ask students to explain why a river alone does not prove two frog populations are separate species.
Give groups cards showing a river, different mating calls, and sterile offspring; have them sort the cards by how each stops gene flow.
Show photos of apple maggot flies on apples and hawthorns; ask how mating on different fruits could reduce gene flow.
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