A2 Biology OCR June 2015 Revision Thread

Really hate the genetics stuff.

Gonna fail this

HOW ARE WE MEANT TO GET THE WHOLE OF F215 IN OUR HEADS?

feel like my brain is going to explode!

Gonna fail this

what are the functions of involuntary, voluntary and cardiac muscle.

Gotta believe

Can someone very briefly explain how alleles spread throughout a population?

A certain allele with a particular advantageous function may give an organism a selective advantage over organisms that don't have this allele.
This allele came about by a random mutation.
Those with this advantageous allele are more likely to survive and reproduce to pass this mutated allele onto their offspring.
The frequency of this allele will increase over generations.

E.g. if a zebra had an allele caused by a random mutation that gave it the ability to outrun its predator, this is a selective advantage. This zebra will be more likely to survive than other zebras without this allele. This zebra will be more likely to pass its mutated allele onto future generations so that a future population of zebras will have more of these mutated alleles present than the previous population

Voluntary (skeletal) - movement of limbs
Cardiac - contraction of the heart/pump blood
involuntary (smooth) - something to do with autonomic control but I know this isn't specific enough, if someone could add that would be great!

whats likely to come up guys??

(there's no time to go over the whole spec if you're going to say that to me )