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Biology
A Level

Explain the formation of a new species

Speciation (the formation of a new species) can be broken down into a few concise steps.

The most important step is the isolation of two populations. This usually occurs because of physic...

AJ
Answered by Aidan J. • Biology tutor
11784 Views

How are chloroplasts adapted to their function?

Many grana, large surface area for photosynthetic pigments, electron carriers and ATP synthase enzymes. 

Photosynthetic pigments are arranged into structures called photosystems, allows m...

MA
Answered by Matthew A. • Biology tutor
112845 Views

What is the all or nothing principle?

Basically this means that if the threshold voltage of a neurone is reached -40mV, then a stimulus will be generated of always +40mV. If the threshold is not reached then there will be no signal. 

KD
Answered by Katie D. • Biology tutor
9561 Views

What is speciation?

Speciation is the EVOLUTION of a NEW SPECIES from an EXHISTING SPECIES. 

If two populations are seperated so the flow of alleles stops (e.g geographic isolation- a physical barrier that p...

KD
Answered by Katie D. • Biology tutor
6486 Views

What is sex linkage?

 

Sex linkage is a type of genetic disease, where the gene with the faulty allele is carried on the X chromosome. 

Women have 2X chromosomes whilst men only have 1. Conseque...

KD
Answered by Katie D. • Biology tutor
10143 Views

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