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LoE - Speciation

Life on Earth - Topic 4 - Mutations, Adaptations & Speciation

What is a mutation? A random change to DNA bases
Mutations can either be advantageous, disadvantageous or.... Neutral
What is an example of an advantageous mutation? Peppered moth turning into a black moth for better camouflage
What is a mutagenic agent? Something that increases the frequency of a mutation occuring
Name 2 examples of mutagenic agents. X-rays & UV radiation
Desert rat burrows into the sand when temperatures are too high - structural or behavioural adaptation? Behavioural
Cactus has sharp spines instead of leaves to reduce water loss - structural or behavioural adaptation? Structural
What process describes how the best suited organisms are able to survive and pass on their genes? Natural selection
Define a species. Organisms that can interbreed to produce fertile offspring
What process leads to a new species being made? Speciation
What splits the initial population into 2 sub-populations at the beginning of speciation? Isolating mechanism
Give 2 examples of a geographical isolating mechanism. River & mountain
Created by: StNiniansHS