Q. No.What is the mode of inheritance of phenylketonuria?
1. Autosomal recessive 2. Autosomal dominant 3. Sex linked recessive 4. Sex linked dominant
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Which of the following is not a feature of Down’s Syndrome?
| 1. | It is caused by a non-disjunction in an autosome. |
| 2. | The affected individual has a trisomy of chromosome 21. |
| 3. | The affected individual has a characteristic simian palmar crease. |
| 4. | The mental development of the affected individual is normal. |
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Pedigree analysis is used for genetic analysis in humans rather than conventional genetic methods because:
| I: | Choice matings are not possible. |
| II: | The number of progeny is limited. |
Of the two statements:
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
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A plant with the genotype Tt should be called:
| 1. | Heterologous | 2. | Hemizygous |
| 3. | Heterozygous | 4. | Dihybrid |
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What is F2 phenotypic ratio in a dihybrid cross?
| 1. | 1 : 1 | 2. | 3 : 1 |
| 3. | 9 : 3 : 3 : 1 | 4. | 1 : 1 : 1: 1 |
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In cases of Phenylketonuria:
| 1. | The affected individual lacks an enzyme that converts the amino acid tyrosine into phenylalanine. |
| 2. | The affected individual makes an enzyme that converts the amino acid tyrosine into phenylalanine. |
| 3. | The affected individual makes an enzyme that converts the amino acid phenylalanine into tyrosine. |
| 4. | The affected individual lacks an enzyme that converts the amino acid phenylalanine into tyrosine. |
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In sickle cell anaemia, the mutant haemoglobin molecule undergoes:
| 1. | Polymerisation under low oxygen tension causing changes in the shape of the RBC to a sickle-like structure |
| 2. | Depolymerisation under low oxygen tension causing that changes the shape of the RBC to a sickle-like structure |
| 3. | Denaturation under high oxygen tension causing changes in the shape of the RBC to a sickle-like structure |
| 4. | Denaturation |
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T. H. Morgan worked on the fruit fly, Drosophila melanogaster. Which of the following is not an advantage of this fly?
| 1. | They could be grown on a simple synthetic medium in the laboratory. |
| 2. | They complete their life cycle in about two years, and a single mating could produce a large number of progeny flies. |
| 3. | There was a clear differentiation of the sexes – the male and female flies are easily distinguishable. |
| 4. | It has many types of hereditary variations that can be seen with low-power microscopes. |
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In true breeding, the allelic pair of genes are:
| 1. | Homologous | 2. | Linked |
| 3. | Stable | 4. | Homozygous |
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