Topic explanation · Public Library

Biology · Class 12

Standard explanation

Individuals vary, some variation is heritable, more offspring are produced than survive, and carriers of advantageous variants leave more descendants.

Key points

natural selection
cause → mechanism → outcome
natural, selection
definition · mechanism · significance
Natural selection: Individuals vary, some variation is heritable, more offspring are produced than survive, and carrier
Mechanism: Start with the trigger or starting condition, follow the biological structures and signals in order,
Biological significance: Understanding natural selection connects structure, mechanism and biological outcome. It helps expla
WHAT — NATURAL SELECTION: Individuals vary, some variation is heritable, more offspring are produced than survive, and carrier

Labelled diagram

Food chain — Natural Selection — original sketch for this lesson (not copied from a textbook).

Scientists connected to this topic

Portrait of Charles Darwin — **Charles Darwin**
Known for: Natural selection as an explanation of adaptation and descent with modification.
Why this scientist matters
Darwin proposed natural selection as the main mechanism of evolution.
Wikimedia Commons — photograph of Charles Darwin (public domain).