OCR A-Level Biology Inheritance and Variation(2) Summary

z)
Chi-Squared : ( =
[(0 -




E

s Observed Expected frequency
Test Statistic
frequency
=

0: =




↳ compares observed and expected results to prove a null hypothesis
Null
hypothesis Any Variation is due to chance
:




↳ Determined where of and co is
using probability table
a is n <
po .
os




Epistatis :

Interaction of
genes at different loci

Hypostatic Gene affected by another gene
-
:

Is

Epistatic Gene Affects
-

another
gene
:




↳
epistatic gene may be
An needed for a
hypostatic gene to be expressed
Dominant epistatis If a dominant auele has an effect on another
gene
:




Recessive epistatis If two recessive aueles lead to the lack of an
enzyme
: