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In Antirrhinum (dog flower), phenotypic ratio in F2 generation for the inheritance of flower colour would be
- a)3:1
- b)1:2:1
- c)1:1
- d)2:1
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
In Antirrhinum (dog flower), phenotypic ratio in F2 generation for the...
The inheritance of flower colour in the Antirrhinum majus (snapdragon or dog flower) is an example of incomplete or partial dominance. Incomplete dominance is the phenomenon in which neither of the two alleles of a gene is completely dominant over the other. In a cross between true-breeding redflowered (RR) and true-breeding white-flowered plants (rr), the F1 plants obtained were pink (Rr) coloured. When the F1 plants were self-pollinated, the F2 generation resulted in the ratio, 1(RR) Red : 2(Rr) Pink : 1(rr) White. The phenotypic ratios had changed from the normal 3:1 dominant : recessive ratio to 1:2:1. R was not completely dominant over r and this made it possible to distinguish Rr (pink) from RR (red) and rr (white).
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In Antirrhinum (dog flower), phenotypic ratio in F2 generation for the...
Explanation:
Antirrhinum (dog flower) Inheritance:
Antirrhinum, commonly known as snapdragon or dog flower, exhibits a classic example of incomplete dominance in flower color inheritance. Incomplete dominance is a genetic phenomenon where the heterozygous genotype produces an intermediate phenotype between the two homozygous genotypes.
Phenotypic Ratio in F2 Generation:
In the F2 generation of Antirrhinum plants, the phenotypic ratio for the inheritance of flower color would be 1:2:1. This ratio is characteristic of incomplete dominance inheritance patterns.
Explanation of 1:2:1 Ratio:
- When a homozygous red-flowered Antirrhinum plant (RR) is crossed with a homozygous white-flowered plant (WW), all the F1 offspring (Rr) will have pink flowers due to incomplete dominance.
- When the F1 pink-flowered plants (Rr) are self-crossed, the F2 generation will exhibit a phenotypic ratio of 1 red-flowered : 2 pink-flowered : 1 white-flowered plants.
- This ratio occurs because the alleles for red and white flowers show incomplete dominance, resulting in the expression of both alleles in the heterozygous offspring.
Therefore, in the F2 generation of Antirrhinum plants, the phenotypic ratio for flower color inheritance would be 1:2:1, reflecting the incomplete dominance of the alleles for red and white flowers in this species.
Antirrhinum (dog flower) Inheritance:
Antirrhinum, commonly known as snapdragon or dog flower, exhibits a classic example of incomplete dominance in flower color inheritance. Incomplete dominance is a genetic phenomenon where the heterozygous genotype produces an intermediate phenotype between the two homozygous genotypes.
Phenotypic Ratio in F2 Generation:
In the F2 generation of Antirrhinum plants, the phenotypic ratio for the inheritance of flower color would be 1:2:1. This ratio is characteristic of incomplete dominance inheritance patterns.
Explanation of 1:2:1 Ratio:
- When a homozygous red-flowered Antirrhinum plant (RR) is crossed with a homozygous white-flowered plant (WW), all the F1 offspring (Rr) will have pink flowers due to incomplete dominance.
- When the F1 pink-flowered plants (Rr) are self-crossed, the F2 generation will exhibit a phenotypic ratio of 1 red-flowered : 2 pink-flowered : 1 white-flowered plants.
- This ratio occurs because the alleles for red and white flowers show incomplete dominance, resulting in the expression of both alleles in the heterozygous offspring.
Therefore, in the F2 generation of Antirrhinum plants, the phenotypic ratio for flower color inheritance would be 1:2:1, reflecting the incomplete dominance of the alleles for red and white flowers in this species.
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