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Summary Alevel OCR Biology A notes on Patterns of Inheritance £3.49
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Summary Alevel OCR Biology A notes on Patterns of Inheritance

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Alevel OCR Biology A notes on Patterns of Inheritance from an A* biology student. Plus diagrams.

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  • July 1, 2023
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  • 2022/2023
  • Summary
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lottiemcgowan1
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l ocus
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Patterns of Inheritance
length of
-gene= t hat
DNA codes for polypeptide/protein
-wal:position of gene an chromosome
Comozygote (HH)
-




genotype:alleles an individual pasesses >heleozygous (Hh)

-




phenotype:observable characteristics of an
organism

codominance:
-




b oth alleles expressed in
phenotype at same tire



(xx),
-




sexlinhage=
women men (XY)


=most sex linked genes on long chromosome
x



Autosomal linkage autoscre (chromosome that out sexchromocre), or
-
=


sale
a two more
genes on



done
chromosome assen
independently dering weicis


Phevolype= (diffaucles), factors
-




genetic factors emironmental (diff global environment

individuals: afferences D NA
-




same species: similar genotype, in base sequence -
genetic variation in


sexual reproduction


crossing von-sister
over= chromatide exchange alleles



=meiosis I, lomologous chromosomes pair up, non-sister chromatic pair up entangle,
+




crossing points (diasmatas, entanglement stress or DNA
molecules =
chromatic section


breaks rejoins w/ chromate
+
of other chromosome.


=new combination of alleles on a chronosaries


Independent assortment dift
=


combo of alleles daughter
in als de random
to alignment of
↳ increase genetic variation between gameles.
honologate pairs along equator
the of the
spindle metaphase
in 1.



Random gamete fusion:e a c h garrete:d ifferent alleles, lentilication:
any male garrete uses of any


female garel= zygote


Mutations alleles random change D NA base
-




generous new sequence
=

in



-




Maolybrid crosses auells
=

from are single gene paced from are generation the
to
next=punner square

sex linkage purer square phenotypes
-



in not spread evenly across
=


sexes




Epistaxis different affect
-



a
-


genes an chromosomes same feature



d iff
Chi-squared: between expected obiered significance,categorical
-


+ values experiment
in
+
data


I
=



E
=

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