Q. No.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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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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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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In the case of co-dominance, the F1 generation resembles:
| 1. | Dominant parent | 2. | Recessive parent |
| 3. | Both the parents | 4. | None of the parents |
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Genes that code for a pair of contrasting traits or slightly different forms of the same gene are known as:
| 1. | Alleles | 2. | Loci |
| 3. | Cistrons | 4. | Introns |
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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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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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