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Summary Topic 3 Genes

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Edexcel Biology Topic 3 Genes, Base Sequence, Code,

Institution
OCR
Course
Topic 3








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Written for

Study Level
A/AS Level
Examinator
OCR
Subject
Biology A
Unit
Topic 3
All documents for this subject (10)

Document information

Uploaded on
January 19, 2025
Number of pages
1
Written in
2022/2023
Type
Summary

Subjects

  • topic 3
  • edexcel
  • biology

Content preview

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
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