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SPeciation guided notes, Lecture notes of Biology

Biology

High School Biology introductory

Typology: Lecture notes

2025/2026

Uploaded on 02/18/2026

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Name: ____________________________________________________ Date: _______________ Block:
_________ Biology
Speciation Guided Notes
Warm up: Please answer the following questions to the best of your
ability. There are no right answers, and the only wrong answers are
the ones you don’t attempt.
1. What is a species?
_______________________________________________________________________________________
___________________________________________________________________________________________
__________________
2. Some examples of species are:
________________________________________________________________________
___________________________________________________________________________________________
__________________
3. How do biologists decide if two populations are of the same or different species?
___________
___________________________________________________________________________________________
___________________________________________________________________________________________
___________________________________________________________________________________________
______________________________________________________
Biological Species: when organisms breed and produce _____________________________________,
the result of this interbreeding is
_________________________________________________________________, called
__________________________, throughout the species.
Gene Pool: Members of the same species share a
______________________________________________________ and a common
_________________________ history.
Different Species: When are organisms not the same species?
1. When they mate but produce
_____________________________________________________________
2. When they very rarely breed with each other even when
____________________________ _______________________________________
New Species: But wait, how do new species evolve??? Record your thoughts now!
_____________
______________________________________________________________________________________________
______________________________________________________________________________________________
_____________________________________
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Name: ____________________________________________________ Date: _______________ Block: _________ Biology

Speciation Guided Notes

Warm up: Please answer the following questions to the best of your ability. There are no right answers, and the only wrong answers are the ones you don’t attempt.

  1. What is a species?
  2. Some examples of species are:
  3. How do biologists decide if two populations are of the same or different species?

Biological Species: when organisms breed and produce _____________________________________, the result of this interbreeding is _________________________________________________________________, called __________________________ , throughout the species. Gene Pool: Members of the same species share a ______________________________________________________ and a common _________________________ history. Different Species: When are organisms not the same species? 1. When they mate but produce _____________________________________________________________ 2. When they very rarely breed with each other even when ____________________________ _______________________________________ New Species: But wait, how do new species evolve??? Record your thoughts now!

Reproductive Isolation: refers to any ___________________ that prevents two populations from reproducing successfully. This prevents them from sharing a ________________________________ ____________ and possibly leads to the evolution of the populations into _____________________________. Reproductive Isolation: mechanisms by which it occurs in nature (ie-how it can happen)

  1. Behavioral Isolation
  2. Habitat Isolation
  3. Geographic Isolation
  4. Temporal Isolation
  5. Mechanical Isolation
  6. Gametic Isolation ____________________ Isolation-two species’ mating songs or rituals are too different to recognize ____________________ Isolation-two species live in the same area but in two different habitats ____________________ Isolation-two species are separated by geologic changes (formation of mountains, rivers, etc.) ____________________ Isolation-two species breed at different times of the year ____________________ Isolation-two species do not have the anatomical structures necessary for mating ____________________ Isolation-sperm and eggs cannot interact (gamete=sex cell) Types of Reproductive Isolation: how it is shown or displayed in the organism itself
  7. Hybrid Sterility: Members of species ________________________, but their offspring are sterile
  8. Reduced Hybrid Sterility: Two species can mate, but the offspring do not live long enough to ____________________________________________________________________ So what is speciation again? Well do you know what extinction is? Right! The elimination of a species. Guess what, speciation is the opposite!

SPECIATION IS THE EVOLUTIONARY PROCESS BY

WHICH NEW SPECIES ARE CREATED.