Let the Brown body color denote ‘B’ which is a dominant trait.
Let the Black body color denote ‘b’ which is a recessive trait.
Let the Red eye color denote ‘E’ which is a dominant trait
Let the Brown eye color denote ‘e’ which is a recessive trait.
The two fruit flies are heterozygous i.e. their parent gametes are
BbEe X BbEe
The gametes of F1 generation after the cross will be
‘BE’, ‘Be’, ‘bE’ and ‘be’
By selfing these gametes, the F2 generation is as follows in the given diagram below:
This cross will yield a Phenotypic ratio of 9 : 3 : 3 : 1
The Genotypic ratio would be 1 : 2 : 1 : 2 : 4 : 2 : 1 : 2 : 1.
9 Dominant character for both traits.
3 Dominant for Eye Color and Recessive for Body Color
3 Dominant for Body Color and Recessive for Eye Color
1 Recessive for both traits
Dihybrid Cross:
- The dihybrid cross is a cross between two different traits of an organism and follows the Mendel’s Law of Independent Assortment.
- The law states that one pair of characters can be separated from the other pair of characters when two pairs of traits are combined to form a hybrid.
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