MYTUTOR SUBJECT ANSWERS

556 views

What are the key principles of evolution?

Variation: there is variation in the physical and behavioural characteristics of a set of organisms. This variation is caused by a combination of genetic and environmental factors.

Inheritance: there is a mechanism by which physical and behavioural characteristics may be passed between generations. Some traits may be more heritable (e.g. eye colour), whilst others (e.g. weight) may be more affected by environmental factors.

Selection pressures: in most cases, organisms produce more offspring than resources can sustain. This creates competition for resources (e.g. food, light, or nest space). These selection pressures mean that some individuals will die, as they do not have enough resources to survive.

Differences in survival and reproduction: because there is variation in different characteristics, and there is competition, those organisms which have the most suitable traits for their current environment will be more likely to survive to be able to reproduce. Conversely, those organisms with unsuitable traits are more likely to die. Therefore, some organisms will produce more offspring than others, and their genes will survive to the next generation.

Ivan S. GCSE Biology tutor, A Level Biology tutor, GCSE Chemistry tut...

1 year ago

Answered by Ivan, an A Level Biology tutor with MyTutor


Still stuck? Get one-to-one help from a personally interviewed subject specialist

190 SUBJECT SPECIALISTS

£20 /hr

Gayathri S.

Degree: Medicine (Bachelors) - Birmingham University

Subjects offered:Biology, Maths+ 3 more

Biology
Maths
.UKCAT.
-Personal Statements-
-Medical School Preparation-

“I’m a medical student keen to pass on my passion for learning to others! I’m immediately available to tutor at flexible times.”

£20 /hr

Darragh C.

Degree: Biomedical Sciences (Neuroscience) (Bachelors) - Edinburgh University

Subjects offered:Biology, Chemistry+ 1 more

Biology
Chemistry
-Personal Statements-

“About me:I study neuroscience at Edinburgh University, and have previously studied Chemistry at University College Dublin. Understanding more about the world around me has always been something I'm passionate about, and science has ...”

MyTutor guarantee

£36 /hr

Hannah S.

Degree: Medicinal Chemistry and Pharmacology (Masters) - Liverpool University

Subjects offered:Biology, English Language+ 3 more

Biology
English Language
Chemistry
-Personal Statements-

“I'm currently studying medicinal chemistry and pharmacology at the University of Liverpool as part of an 'integrated masters' course designed to fast track students interested in a chemistry as a profession or continuing study to a PhD...”

About the author

Ivan S.

Currently unavailable: for regular students

Degree: Natural Sciences (Bachelors) - Cambridge alumni University

Subjects offered:Biology, Spanish+ 5 more

Biology
Spanish
Science
Maths
Human Biology
Chemistry
-Personal Statements-

“Hi! I'm Ivan. I recently graduated from the University of Cambridge with a First Class degree in Natural Sciences, focussing on Biology. I got four A*s and one A at A-Level and have a real passion for science. Our tutor sessions will ...”

You may also like...

Posts by Ivan

What are the key principles of evolution?

What is the key difference between the rough endoplasmic reticulum (RER), and smooth endoplasmic reticulum (SER)?

Other A Level Biology questions

What can endotherms do to reduce their body temperature?

What is speciation?

How does information from a gene make a protein?

What is the difference between type I and type II diabetes?

View A Level Biology tutors

We use cookies to improve your site experience. By continuing to use this website, we'll assume that you're OK with this. Dismiss

mtw:mercury1:status:ok