Q. No.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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The two alleles of a gene pair are located on:
| 1. | The same chromosome. |
| 2. | Different chromosomes. |
| 3. | Homologous sites on homologous chromosomes. |
| 4. | Homologous sites on heterologous chromosomes. |
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