Q. No.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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Morgan, in his experiment on fruit flies, found that the genes white and yellow were very tightly linked and showed:
| 1. | 50 % recombination | 2. | 37.2 % recombination |
| 3. | 12.5 % recombination | 4. | 1.3 % recombination |
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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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