Summary
Summary Evolution by Natural Selection
- Institution
- Clarendon High School
Matric CAPS syllabus
[Show more]
Connected book
Book Title:
Author(s):
- Edition:
- ISBN:
- Edition:
Available practice questions
Flashcards
45 Flashcards
R30,00
0 sales
Some examples from this set of practice questions
1.
What is the theory of evolution
Answer: The theory of evolution states that all things, living and nonliving, of today arose from things in the past
2.
What is biological evolution
Answer: Biological evolution refers to the changes of living things from a common ancestor.
3.
What is Biodiversity
Answer: A wide range of species and organisms making up those species
4.
What is the geographical time scale
Answer: an established scale that deals with the long periods of time of the earth
5.
What is extinction
Answer: A natural occurrence in which a total species dies off. Usually matches the rate of occurrence of a new species.
6.
When did the major animal groups appear
Answer: Cambrian Period
7.
What defines a mass extinction
Answer: when more than 50% of species vanish over a few million years
8.
What is a species
Answer: Similar organisms which interbreed to produce fertile offspring
9.
What is a population
Answer: A group of species in the same location
10.
What is variation
Answer: Differences within a population
Content preview
CHAPTER TENEVOLUTION BY NATURAL
SELECTION
HYPOTHESIS AND THEORY
● Observations made and facts analyzed during discovery inquiry which lead
to generalizations via inductive reasoning
● Explanatory inquiry allows scientists to try to find explanations for
those generalizations. These are the hypotheses.
● Deductive reasoning is used during hypothesis testing
● Laws are large generalizations. The fact-based explanation for these
laws is referred to as the theory.
EVOLUTION
● The theory of evolution states that all things, living and nonliving, of
today arose from things in the past
● Biological evolution refers to the changes of living things from a
common ancestor.
● ‘Descent with modification’
DIVERSITY OF LIFE AND EVOLUTION
BIODIVERSITY: a wide range of species and organisms making up those species
GEOLOGICAL TIME SCALE: an established scale that deals with the long periods
of time of the earth
EXTINCTION: a natural occurrence in which a total species dies off. Usually
matches the rate of occurrence of a new species.
● Major animal groups appeared during the Cambrian Period
● Mass extinctions are when more than 50% of species vanish over a few
million years
, VARIATION
SPECIES: Similar organisms which interbreed to produce fertile offspring
POPULATION: A group of species in the same location
VARIATION: Differences within a population
SOURCES OF VARIATION
1. MUTATIONS
2. CROSSING-OVER (MEIOSIS)
3. RANDOM ARRANGEMENT (MEIOSIS)
4. RANDOM FERTILIZATION
CONTINUOUS VARIATION
● Has a range of phenotypes for one particular characteristic
● Many genes are working together
● Polygenic inheritance
● Often affected by environmental influences
● Eg milk yield
DISCONTINUOUS VARIATION
● Does not have a range of phenotypes for one particular characteristic
● Can’t be measured across a complete range
● The characteristic is either there or it is not
● Controlled by alleles of a single gene
● Environment has no effect
EVIDENCE FOR EVOLUTION
● Based off of major assumption
● The assumption is that species change through the forces of natural
selection and the evidence is that different species are related
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through EFT, credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying this summary from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller charlottiiieeeg. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy this summary for R50,00. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
82215 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy summaries for 14 years now