Q. No.In Phenylketonuria,
I.
Phenylpyruvic acid and other derivatives are accumulated in the brain resulting in mental retardation.
II.
These are also excreted through urine because of their poor absorption by the kidney.
1. Only I is correct 2. Only II is correct 3. Both are correct 4. Both are incorrect
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The F1 progeny in monohybrid crosses by Mendel resembled:
| 1. | The parent exhibiting the dominant trait completely |
| 2. | The parent exhibiting recessive trait comp |
| 3. | The parent exhibiting the dominant trait partly |
| 4. | The parent exhibiting recessive traits partly |
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Failure of cytokinesis after telophase stage of cell division results in an increase in a whole set of chromosomes in an organism and this phenomenon is known as:
| 1. | Aneuploidy | 2. | Translocation |
| 3. | Polyploidy | 4. | Inversion |
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Theoretically, what can be the maximum number of alleles a particular gene can have?
| 1. | 1 | 2. | 2 |
| 3. | 3 | 4. | Any number |
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Which of the following is not true for the Law of Dominance given by Mendel?
| 1. | Characters are controlled by discrete units called factors. |
| 2. | Factors occur in pairs. |
| 3. | In a dissimilar pair of factors, one member of the pair dominates the other. |
| 4. | The alleles show blending at the time of fertilization. |
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Monosomy means:
| 1. | Lack of one pair of chromosomes |
| 2. | Lack of one of any one pair of chromosome |
| 3. | Presence of an extra chromosome |
| 4. | Presence of an extra set of chromosomes |
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An individual affected by Klinefelter’s syndrome:
| 1. | Has 47 autosomes. |
| 2. | Has overall feminine development. |
| 3. | Has gynecomastia. |
| 4. | Has an additional copy of the Y chromosome. |
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An individual affected with Turner’s Syndrome:
| I: | Is a female |
| II: | Has 45 chromosomes |
| III: | Has rudimentary ovaries |
Of the above statements, the correct statements are:
| 1. | Only I and II | 2. | Only I and III |
| 3. | Only II and III | 4. | I, II and III |
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It is unfortunate that in our society women are blamed for producing female children and have been ostracised and ill-treated because:
| 1. | The sex is determined by the type of sperm fertilizing the egg |
| 2. | The sex is determined by the type of egg fertilizing the sperm |
| 3. | The sex is determined by the hormones produced by the fetus |
| 4. | The sex is determined by God’s Will |
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The units of inheritance according to Mendel were ‘factors’. Today these factors are known as:
| 1. | Gametes | 2. | DNA |
| 3. | Genes | 4. | RNA |
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