Genes and the environment
Cancer-uncontrolled cell division
radiation
ionising
-
UV ,
S.I units -
X-ray
~
Gamma
~
Carcinogens ; tobacco smoke , abestos
mutation involved in cell division
proto-oncogenes >
- stimulate cell division
cell
differention
>
-
stop
Proto-oncos
Oncogenes metal igi
a
Tumour supressor genes prevent tumour
formation
-
>
-
promote apoptosis
-Polygenic Inheritance when multiple
-
loci determine a
genes , found at
and different
therefore to
single
continuous
Phenotype
give rise
Variation
↳ can take value within a
a
range
Phenotype affected by
continuous
display variation
-
are
bote +
genes environment
polygenic
=
Discontinuous = discrete
categories
Cancer-uncontrolled cell division
radiation
ionising
-
UV ,
S.I units -
X-ray
~
Gamma
~
Carcinogens ; tobacco smoke , abestos
mutation involved in cell division
proto-oncogenes >
- stimulate cell division
cell
differention
>
-
stop
Proto-oncos
Oncogenes metal igi
a
Tumour supressor genes prevent tumour
formation
-
>
-
promote apoptosis
-Polygenic Inheritance when multiple
-
loci determine a
genes , found at
and different
therefore to
single
continuous
Phenotype
give rise
Variation
↳ can take value within a
a
range
Phenotype affected by
continuous
display variation
-
are
bote +
genes environment
polygenic
=
Discontinuous = discrete
categories
