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Summary OCR A-Level Biology 6.2.3 Dihybrid Inheritance
Revision summary of key knowledge from OCR A-Level Biology 6.2.3 Dihybrid Inheritance.
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Dihybrid InheritanceMonohybrid Cross
Dihybrid = determined by two gene loci
Results in a 9:3:3:1 ratio
Example: Dominant = T Recessive = t
Homozygous Dominant = TT Heterozygous = Tt Homozygous Recessive = tt
Punnett Squares:
Parent Phenotype Double Heterozygous x Double Heterozygous
Parent Genotype AaBb x AaBb
Parent Gametes AB Ab aB ab AB Ab aB ab
Dihybrid Cross AB Ab aB ab
A AAB AAB
AABB
B b AaBb b
A AAb
AABb
b b AaBb Aabb
AAB
aB AaBb b aaBB aaBb
ab AaBb Aabb aaBb aabb
Ratio AB = 9
Ab = 3
aB = 3
ab = 1
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