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Genetic pedigrees
parents
female
offspring
male
Genetic pedigree A
Genetic pedigree A explained
Parents
phenotype
Affected
Parents
genotype
Hh
Gametes
H or h
Genotypes
of offspring
Phenotypes
of offspring
Hh
x
unaffected

&
hh
h only
hh
1 affected : 1 unaffected
Genetic pedigree B
Genetic pedigree B explained:1
For the first section (parents giving rise to the first generation):
Parents
phenotype
Parents
genotype
Gametes
Genotypes
of offspring
Phenotypes
of offspring
affected x
ff
f only
unaffected

FF
F only
ALL Ff
unaffected - carriers
Genetic pedigree B explained:2
For the second section ( two carriers giving rise to the second generation):
First generation
unaffected x
phenotype
(carrier)
First generation
Ff
genotypes

unaffected
(carrier)
Ff
Gametes
F or f
Genotypes
of second
generation
Phenotypes of
second generation
offspring
FF Ff Ff
ff
3 unaffected : 1 affected
2/3 carriers
1/3 completely
unaffected
F or f
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