Extinction and Speciation

Description

GCSE Biology (B2b) Flashcards on Extinction and Speciation, created by francesca graham on 08/04/2016.
francesca graham
Flashcards by francesca graham, updated more than 1 year ago
francesca graham
Created by francesca graham over 8 years ago
4
0

Resource summary

Question Answer
What does the fossil record contain? Many species that don't exist any more
Give 6 reasons why species become extinct 1) Environmental changes 2) New predators 3) New diseases 4) New competitors for food 5) A catastrophic event 6) A new species develops (speciation)
What is speciation? The development of a new species
What is a species? A group of similar organisms that can reproduce to produce fertile offspring.
When does speciation occur? When populations of the same species become so different that they can no longer breed together to produce fertile offspring
What 2 things lead to speciation? Isolation and natural selection
What is isolation? Where populations of a species is separated.
What causes isolation? Physical barriers
How does speciation occur?
Why do different environments cause speciation? Different characteristics will become more common in each population due to natural selection
How does natural selection effect speciation? In each population, individuals with characteristics that make them batter adapted to their environment have a better chance of survival and so are more likely to breed successfully. So the alleles that control the beneficial characteristics are more likely to be passed on to the next generation
Show full summary Hide full summary

Similar

GCSE AQA Biology 1 Quiz
Lilac Potato
GCSE Biology AQA
isabellabeaumont
Enzymes and Respiration
I Turner
Biology Unit 1a - GCSE - AQA
RosettaStoneDecoded
B3 Quiz
Tess Brockway
GCSE AQA Biology - Unit 2
James Jolliffe
Biology AQA 3.1.3 Cells
evie.daines
Biology AQA 3.2.5 Mitosis
evie.daines
GCSE AQA Chemistry 2 Salts & Electrolysis
Lilac Potato
AQA Biology 8.1 structure of DNA
Charlotte Hewson
Biology- Genes and Variation
Laura Perry