1
Question
Column I Column II
A. Inhibitory gene ratio 1. 9 : 3 : 4 B. Complementary gene ratio 2. 1: 1: 1 : 1 C. Recessive epistasis ratio 3. 12 : 3 : 1 D. Dihybrid test cross ratio 4. 13 : 3 E. Dominant epistasis ratio 5. 9: 7
Match the column given above, genetic phenomena with their respective ratios.
| Column I | Column II |
| A. Inhibitory gene ratio | 1. 9 : 3 : 4 |
| B. Complementary gene ratio | 2. 1: 1: 1 : 1 |
| C. Recessive epistasis ratio | 3. 12 : 3 : 1 |
| D. Dihybrid test cross ratio | 4. 13 : 3 |
| E. Dominant epistasis ratio | 5. 9: 7 |
Match the column given above, genetic phenomena with their respective ratios.
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Solution
The correct option is D A- 4, B- 5, C- 1, D- 2, E- 3
Inhibitory Gene ratio: In this type of epistasis, a dominant allele at one locus can mask the expression of both (dominant and recessive) alleles at a second locus. This is also known as inhibitory gene interaction.
An example of this type of gene interaction is found for anthocyanin pigmentation in rice. The green colour of plants is governed by the gene which is dominant over purple colour. The purple colour is controlled by a dominant gene P. When a cross was between green (IIpp) and (iiPP) colour plants, the F1 was green. This indicates that F1 plants produced green and purple plants in 13:3 ratio in F2.
Complementary Gene Ratio:
When recessive alleles at either of the two loci can mask the expression of dominant alleles at the two loci, it is called duplicate recessive epistasis. This is also known as complementary epistasis. This yields ratio - 9:7
Recessive Epistasis: Here one dominant gene has its own phenotypic effect and another dominant gene has no effect of its own but its presence with the first 9:3:4 gene modified the phenotypic expression. Thus, in supplementary gene action, the dominant allele of one gene is necessary for the development of the concerned genotype, while the other gene modifies the expression of the first gene. It yields the ratio 9:3:4
Dihybrid Test cross-ratio:
The dihybrid test cross ratio given by Mendel is 1:1:1:1
Dominant epistasis Ratio:
The ratio is 12:3:1
An example of dominant epistasis is found for fruit colour respectively, white, yellow and green.
Hence, option B is correct.
Inhibitory Gene ratio: In this type of epistasis, a dominant allele at one locus can mask the expression of both (dominant and recessive) alleles at a second locus. This is also known as inhibitory gene interaction.
An example of this type of gene interaction is found for anthocyanin pigmentation in rice. The green colour of plants is governed by the gene which is dominant over purple colour. The purple colour is controlled by a dominant gene P. When a cross was between green (IIpp) and (iiPP) colour plants, the F1 was green. This indicates that F1 plants produced green and purple plants in 13:3 ratio in F2.
Complementary Gene Ratio:
When recessive alleles at either of the two loci can mask the expression of dominant alleles at the two loci, it is called duplicate recessive epistasis. This is also known as complementary epistasis. This yields ratio - 9:7
Recessive Epistasis: Here one dominant gene has its own phenotypic effect and another dominant gene has no effect of its own but its presence with the first 9:3:4 gene modified the phenotypic expression. Thus, in supplementary gene action, the dominant allele of one gene is necessary for the development of the concerned genotype, while the other gene modifies the expression of the first gene. It yields the ratio 9:3:4
Dihybrid Test cross-ratio:
The dihybrid test cross ratio given by Mendel is 1:1:1:1
Dominant epistasis Ratio:
The ratio is 12:3:1
An example of dominant epistasis is found for fruit colour respectively, white, yellow and green.
Hence, option B is correct.
Complementary Gene Ratio:
When recessive alleles at either of the two loci can mask the expression of dominant alleles at the two loci, it is called duplicate recessive epistasis. This is also known as complementary epistasis. This yields ratio - 9:7
Recessive Epistasis: Here one dominant gene has its own phenotypic effect and another dominant gene has no effect of its own but its presence with the first 9:3:4 gene modified the phenotypic expression. Thus, in supplementary gene action, the dominant allele of one gene is necessary for the development of the concerned genotype, while the other gene modifies the expression of the first gene. It yields the ratio 9:3:4
Dihybrid Test cross-ratio:
The dihybrid test cross ratio given by Mendel is 1:1:1:1
Dominant epistasis Ratio:
The ratio is 12:3:1
An example of dominant epistasis is found for fruit colour respectively, white, yellow and green.
Hence, option B is correct.
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