Mysteries of Speciation Explained for AP Bio Students

Описание: 🎯 *Struggling with AP Bio?* With *Learn-Biology.com**, you’ll gain the skills and confidence to earn a 4 or 5 on the AP Bio exam — *guaranteed!
➡️ [https://learn-biology.com/apbiology](https://learn-biology.com/apbiology)

🌱 *Master AP Bio Unit 7: Speciation and Extinction* 🌱
In this lesson, you’ll explore how new species form, why some go extinct, and how reproductive isolation, natural selection, and geography shape the tree of life. These ideas are central to **AP Biology Topics 7.4 and 7.5**.

💡 *In this video you’ll learn:*
⭐ What the *biological species concept* is — and its limitations
⭐ How *reproductive isolation* maintains species boundaries
⭐ The difference between *prezygotic* and *postzygotic* barriers
⭐ How *allopatric* and *sympatric* speciation occur
⭐ What *polyploidy**, **adaptive radiation**, and **microhabitat adaptation* mean
⭐ Real examples of speciation — from Galápagos finches to African cichlids
⭐ How speciation and extinction connect to evolution’s big picture

🕒 *Chapters*
0:00 Introduction — AP Biology Unit 7: Speciation and Extinction
0:05 The Biological Species Concept — Definition and Limitations
1:18 Reproductive Isolating Mechanisms
2:12 Prezygotic Barriers — Behavioral, Temporal, Mechanical, Habitat, and Gametic
3:15 Postzygotic Barriers — Hybrid Inviability, Sterility, and Breakdown
4:03 Allopatric vs. Sympatric Speciation
4:50 How Geographic Isolation Leads to Reproductive Isolation
5:59 Sympatric Speciation — Polyploidy and Rapid Change
6:22 Speciation in African Cichlids 🐠
6:47 Microhabitat Adaptation and Reproductive Isolation in Lice
8:00 Adaptive Radiation — One Species Becomes Many
9:02 Homologous and Vestigial Traits as Evidence of Adaptive Radiation
9:08 Wrap-Up — Next Steps for AP Biology Success

📘 *Download your FREE AP Bio Checklist* — it tells you exactly what to study for Unit 7 (and the rest of AP Biology)!
➡️ [https://apbiosuccess.com/checklist](https://apbiosuccess.com/checklist)

📱 *Crush your course with Mr. W’s Biomania App!*
iPhone ➡️ [https://apbiosuccess.com/biomaniafori...](https://apbiosuccess.com/biomaniafori...)
Android ➡️ [https://apbiosuccess.com/biomaniafora...](https://apbiosuccess.com/biomaniafora...)

🎨 *Credits:* Many images in this video were created with BioRender. Go to [https://www.biorender.com](https://www.biorender.com)

👉 *#apbiology #speciation #evolution*