Statement I: | A is Emasculation where the anthers are removed only after maturity. |
Statement II: | B is Pollination and it should be followed by bagging the flowers in the female parent. |
1. | The results will be the same in F1 generation but will be different in F2 generation. |
2. | The results will be different in F1 generation but will be same in F2 generation. |
3. | The results will be the same in both F1 generation and F2 generation. |
4. | The results will be different in both F1 generation and F2 generation. |
Statement I: | In situation A, the plant with the dominant phenotype [genotype unknown] must be homozygous dominant. |
Statement II: | In situation B, the plant with the dominant phenotype [genotype unknown] must be heterozygous. |
Assertion (A): | Dominance is not an autonomous feature of a gene or the product that it has information for. |
Reason (R): | The frequency of a gene or an allele in a population is ultimately decided by factors such as natural selection. |
1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
3. | (A) is True but (R) is False. |
4. | (A) is False but (R) is True. |
Statement I: | X will be parental types (98.7%) and recombinant types (1.3%); Y will be parental types (62.8%) and recombinant types (37.2%) |
Statement II: | The strength of linkage is inversely proportional to the distance between the genes located on the same chromosome. |
1. | 2 genes | 2. | 3 genes |
3. | 4 genes | 4. | 6 genes |
1. | 6/64 | 2. | 15/64 |
3. | 20/64 | 4. | 1/64 |
I: | Polygenic inheritance takes into account the influence of the environment. |
II: | In a polygenic trait, the phenotype reflects the contribution of each allele, i.e., the effect of each allele is additive. |
III: | The normal distribution curve is bell-shaped in polygenic inheritance. |
IV: | It is also known as quantitative inheritance. |
1. | 0 | 2. | 1 |
3. | 3 | 4. | 4 |
I: | Where a single gene can exhibit multiple phenotypic expressions, such a gene is called a pleiotropic gene. |
II: | The underlying mechanism of pleiotropy in most cases is the effect of a gene on metabolic pathways which contribute towards different phenotypes. |
III: | Phenylketonuria is caused by a defect in the gene that codes for the enzyme phenylalanine hydroxylase and manifests itself through phenotypic expression characterised by mental retardation and a reduction in hair and skin pigmentation. |
1. | Statement I is correct, Statement II is correct, Statement III is incorrect. |
2. | Statement I is incorrect, Statement II is correct, Statement III is incorrect. |
3. | Statement I is correct, Statement II is incorrect, Statement III is correct. |
4. | Statement I is correct, Statement II is correct, Statement III is correct. |