Cambridge International AS and A Level Biology Coursebook with CD-ROM
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.
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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