Class notes
chapter 1 how life works
Lecture notes study book Biology How Life Works 2e With LP of Morris, James R., Hartl, Daniel L. (1) - ISBN: 9781137607102, Edition: 1, Year of publication: 2016 (bio notes)
[Show more]
Connected book
Book Title:
Author(s):
- Edition:
- ISBN:
- Edition:
Seller
FollowContent preview
Chapter 1: Life - Chemical, Cellular, and EvolutionaryFoundations
Section 1.4: Evolution
- the unity and the diversity of life are explained by evolution (change over time)
- evolution: changes in the genetic makeup of populations over time, sometimes
resulting in adaptation to the environment and the origin of new species
- variations in populations provides the raw material for evolution
- natural selection: process in which, when there is inherited variation in a population of
organisms, the variants best suited for growth and reproduction in a given
environment contribute disproportionately to future generations; of all the evolutionary
mechanisms, natural selection is the only one that leads to adaptations
- farmers use this theory to get crops with high yield or improved resistance to weather;
people use this to develop dog breeds
- causes of variation among individuals within a species is grouped into 2 broad
categories - environmental variation and genetic variation
- environmental variation: due to differences in the environment - e.g. some apples get
sunlight but some are in the shade
- genetic variation: differences in the genetic material that’s transmitted from parents -
e.g. DNA differences can lead to physical differences
- genetic variation arises ultimately from mutations, which come from random errors
during DNA replication or from environmental factors (UV radiation damages DNA)
- most mutations that harm growth and reproduction die out after a number of
generations but the ones that are beneficial can stay for hundreds of generations and
become incorporated into the genetic makeup of every individual in the species
- evolution predicts a nested pattern of relatedness among species, depicted as a tree
called the tree of life
- tree of life makes predictions for the order of appearance of different life-forms in the
fossil record
1
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 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 these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller girimabhalla. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for CA$10.72. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
82871 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now