Published by:
CGP EDU Academic Team
Published on: September 12, 2026
The incorrect option with respect to a dihybrid cross is
A
The phenotypic ratio is 
B
Number of progeny having homozygous recessive alleles for both the characters 
C
Number of progeny having homozygous dominant alleles for both the characters 
D
Number of progeny having heterozygous alleles for both the characters 
Text Solution
Verified by ExpertsThe correct answer is:
B
In a dihybrid cross involving two traits with complete dominance, the expected phenotypic ratio is 9:3:3:1.
Step 1: The genotypes of the parents are typically represented as AaBb x AaBb.
Step 2: Using a Punnett square for a dihybrid cross, we can determine the number of offspring produced with each genotype.
Step 3: The expected phenotype ratios from the cross will yield:
- 9 with dominant traits for both characters (AA BB, Aa BB, AA Bb, Aa Bb)
- 3 with dominant for the first and recessive for the second (AA bb, Aa bb)
- 3 with recessive for the first and dominant for the second (aa BB, aa Bb)
- 1 with recessive for both characters (aa bb)
Step 4: Thus, the total progeny having homozygous recessive alleles for both characters would be 1, not the number indicated in option B.
Therefore, B is the incorrect option.
Step 1: The genotypes of the parents are typically represented as AaBb x AaBb.
Step 2: Using a Punnett square for a dihybrid cross, we can determine the number of offspring produced with each genotype.
Step 3: The expected phenotype ratios from the cross will yield:
- 9 with dominant traits for both characters (AA BB, Aa BB, AA Bb, Aa Bb)
- 3 with dominant for the first and recessive for the second (AA bb, Aa bb)
- 3 with recessive for the first and dominant for the second (aa BB, aa Bb)
- 1 with recessive for both characters (aa bb)
Step 4: Thus, the total progeny having homozygous recessive alleles for both characters would be 1, not the number indicated in option B.
Therefore, B is the incorrect option.
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