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17 Selection and Evolution (diagrams, key points, summary) $7.49   Add to cart

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17 Selection and Evolution (diagrams, key points, summary)

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Scored an A* | A Level Biology notes with contents arranged according to the learner guide. Contains diagrams, easily understood by visual learners. Consists of key points, not too further elaborated, short, concise and straight to the point to equip you for the exam.

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  • August 27, 2020
  • 11
  • 2019/2020
  • Exam (elaborations)
  • Only questions

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By: jin0315hd • 2 year ago

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By: dennismndambi • 3 year ago

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By: SK786 • 3 year ago

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Selection 3 Evolution
( IE A LEVEL BIOLOGY




by Jia Xuan

, VARIATION
CONTINUOUS } DISCONTINUOUS VARIATION




CONTINUOUS VARIATION DISCONTINUOUS VARIATION




Eia Htt .




control characteristic 1 few characteristic
many genes a one
genes control
.
-
a


effect distinct
-




genes
have an additive .


phenotypes
. has a
range of phenotypes -
no
range of
phenotypes
-
environment has significant effect .
not affected by environment
environment factors affects
gene
-




expression eg . blood
type


eg . height




SOURCES OF VARIATION




environment
Genotype t →
phenotype




GENETIC VARIATION

gene pool → sum of all alleles in a
population


T GENETIC VARIATION 4 GENETIC VARIATION

disease disease
← ←
* * *
* * I *

I I *
*
,


large gene pool small
gene pool


organisms with 1 alleles die due to disease




organisms with l and I alleles no other
organisms survive

are immune to the disease

and survive

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