1. | 6/64 | 2. | 15/64 |
3. | 20/64 | 4. | 1/64 |
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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 |
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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. |
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A | ||
B |
1. | Only A | 2. | Only B |
3. | Both A and B | 4. | Neither A nor B |
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I. | The sex determination in honey bee is based on the number of sets of chromosomes an individual receives. |
II. | An offspring formed from the union of a sperm and an egg develops as a female (queen or worker), and an unfertilised egg develops as a male (drone) by means of parthenogenesis. |
III. | The males have double the number of chromosomes than that of a female, therefore, the females are haploid having 16 chromosomes and the males are diploid, i.e., having 32 chromosomes. |
IV. | This is called a haplodiploid sex-determination system. |
V. | The males produce sperms by mitosis, they do not have a father and thus cannot have sons, but have a grandfather and can have grandsons. |
1. | 2 | 2. | 3 |
3. | 4 | 4. | 5 |
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Pedigree Symbol | Meaning | |
1. | Mating between relatives (consanguineous mating) | |
2. | Parents above and children below(in order of birth – left to right) | |
3. | Parents with a male child affected with the disease | |
4. | Five affected offspring |
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1. | Autosomal recessive | 2. | Autosomal dominant |
3. | Sex-linked recessive | 4. | Sex-linked dominant |
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1. | Autosomal recessive | 2. | Autosomal dominant |
3. | Sex-linked recessive | 4. | Sex-linked dominant |
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Statement I: | The peptide chain of the haemoglobin molecule that gets mutated leading to the disease is the alpha chain. |
Statement II: | The mRNA codon X can be GAG and the mRNA codon Y can be GUG. |
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Statement I: | It is an autosome-linked recessive blood disease transmitted from parents to the offspring when both partners are the unaffected carriers for the gene (or heterozygous). |
Statement II: | The defect could be due to either mutation or deletion which ultimately results in a reduced rate of synthesis of one of the globin chains (α and β chains) that make up haemoglobin. |
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