Which of the following was not a character studied by Mendel in garden pea?
1. | Flower position | 2. | Pod shape |
3. | Flower colour | 4. | Pod position |
Assertion (A): | Mendel self-pollinated the F2 plants and found that dwarf F2 plants continued to generate dwarf plants in F3 and F4 generations. |
Reason (R): | The genotype of the dwarfs was homozygous. |
1. | Both (A) and (R) are True but (R) does not correctly explain (A). |
2. | Both (A) and (R) are True and (R) correctly explains Assertion. |
3. | Both (A) and (R) are False. |
4. | (A) is True but (R) is False. |
Assertion (A): | The strength of linkage between two genes is directly proportional to the distance between them on the chromosome. |
Reason (R): | Genes that are farther apart are less likely to be separated by recombination. |
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, (R) is False. |
Assertion (A): | Although there are three alleles for the ABO blood group types in humans, an individual is expected to carry only two of any such alleles. |
Reason (R): | To study multiple allelism, the geneticist must study the population and not an individual. |
1. | (A) is False but (R) is True. |
2. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
3. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
4. | (A) is True but (R) is False. |
I: | Homozygous dominant progeny |
II: | Homozygous recessive progeny |
III: | Heterozygous progeny |
Assertion (A): | In a Mendelian monohybrid cross, the F2 generation exhibits a phenotypic ratio of 3:1. |
Reason (R): | This ratio occurs because alleles segregate independently during gamete formation and recombine randomly during fertilization. |
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. |
1. | Autosomal dominant | 2. | Autosomal recessive |
3. | Sex linked dominant | 4. | Sex linked recessive |
I: | Gregor Mendel, conducted hybridisation experiments on garden peas for seven years (1856-1863). |
II: | During Mendel’s investigations into inheritance patterns, it was for the first time that statistical analysis and mathematical logic were applied to problems in biology. |
Identify an autosomal recessive inborn error of metabolism the effects of which can be completely overcome by regulating the diet of the affected individual:
1. | Cystic fibrosis | 2. | Huntington’s chorea |
3. | Albinism | 4. | Phenylketonuria |