100% satisfaction guarantee Immediately available after payment Both online and in PDF No strings attached
logo-home
Summary A Level Biology notes - Unit 16 Selection and Evolution $7.99   Add to cart

Summary

Summary A Level Biology notes - Unit 16 Selection and Evolution

 5 views  0 purchase
  • Course
  • Institution

A Level Biology Notes: Unit 16 - Selection and Evolution Delve into the fascinating processes of selection and evolution with these comprehensive Level Biology notes for Unit 16! Perfect for students aiming to understand the mechanisms that drive the diversity of life on Earth. Natural Select...

[Show more]

Preview 3 out of 28  pages

  • October 31, 2024
  • 28
  • 2024/2025
  • Summary
avatar-seller
Chapter 17 Selection and evolution

17 1 variation differences that exist between individuals
of a species intraspecific variation

Phenotypic Variation difference in phenotypes between
organisms of the same species

can be caused by due to qualitative or
quantitative differences

genetic factors
environmental factors
for a combination of both




phenotype genotype environment

Genetic Variation
1
small differences in DNA base sequences between individual
organisms within a species population


genetic variation is transferred from one generation to
the next generates phenotypic variation

can be caused by results in a new combination of
alleles in a gamete or individual

independent assortment of bivalents during metaphase I
crossing over of non sister chromatids during prophase I

, random fusion of gametes during fertilisation




nntionnutingenerationofnewa.lu

may beadvantageous disadvantageous or have no

apparent effect on phenotype
genetic code is degenerate

not always seen in the individual they first occur in


can remain hiddennot expressed within a population for
several generations before they contribute to phenotypic
variation


Genes effects on an
organisms phenotype


may be affected by a single gene or several

the impact the gene has on the phenotype varies

, Environmental factors impacts phenotype
e
g
length of sunlight seasonal
food nutrients
availability of water
temperature
oxygen levels

changes in these factors can affect how organisms grow develo


phenotypic variation caused solely by environmental pressures
or factors cannot be inherited by offspring


only alterations to genetic component of gametes
is inherited
by offspring
directly affects
DNA of gametes
enviro doesn't



Discontinuous and Continuous Variation

Discontinuous variation
differences in the phenotypes of individuals within a



qualitative

The benefits of buying summaries with Stuvia:

Guaranteed quality through customer reviews

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

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

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 ellacham. Stuvia facilitates payment to the seller.

Will I be stuck with a subscription?

No, you only buy these notes for $7.99. You're not tied to anything after your purchase.

Can Stuvia be trusted?

4.6 stars on Google & Trustpilot (+1000 reviews)

81113 documents were sold in the last 30 days

Founded in 2010, the go-to place to buy study notes for 14 years now

Start selling
$7.99
  • (0)
  Add to cart