In a dihybrid cross, if one character shows codominance and other character shows incomplete dominance. What will be the genotypic ratio in its progenies ?
Answers
In codominance the genotype ratio is 1:2:1 (eg:sickle cell anaemia )
In case of incomplete dominance also genotype ratio is 1:2:1 (eg: Flower colour in dog flower)
Both these events in this question showing independent assortment hence it will follow multiplication rule of probability.
may this will help you
1 : 2: 1: 2: 4: 2: 1: 2: 1 is the genotypic ratio in progenies.
Explanation:
Codominance character are those in which the two alleles are expressed in the progeny. The example is blood type in human and dotted flower.
The blood type A mates with blood type B individual the resultant progeny can have AB blood type as both the alleles expressed in proportion and both phenotypically and genotypically different from parent.
The white flower crossed with red flower producing patches of red on white base flower is also an example of codominance.
in codominance the genotype ratio comes out as 1:2:1
Cross between white and red flower
R W
W WR WW
R RR WR 1:2:1
In incomplete dominance the two alleles blend to produce a different phenotype with heterozygous alleles.
The phenotype changes but not genotype, it remains same.
cross between red and white flowers producing pink colour.
R r
R RR Rr
r Rr rr
1:2:1 genotype ratio
In case of cross between codominace and incomplete dominance applying the multiplication rule of probability to the genotype ratios.
1:2:1 × 1:2:1
1 : 2: 1: 2: 4: 2: 1: 2: 1 is the genotyope ratio of progenies.
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