Q. No.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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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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The point mutation in sickle cell anaemia leads to a change in the codon. Identify the correct change:
| 1. | UGA to UAA | 2. | GUG to GAG |
| 3. | GAG to GUG | 4. | UAA to UGA |
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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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