Q. No.A man who is an achondroplastic dwarf with normal vision marries a color-blind woman of normal height. The man's father was six feet tall, and both the woman's parents were of average height. Achondroplastic dwarfism is autosomal dominant, and red-green color blindness is X- linked recessive. What proportion of their sons would be color-blind and of normal height?
1.
All
2.
None
3.
Half
4.
One out of four
On the basis of information given in the pedigree, if II 3 marries a hemophilic man, what is the probability that her first child will be normal?
| 1. | 1/4 | 2. | 1/2 |
| 3. | 3/4 | 4. | 0 |
If a chiasma forms between the loci of genes A and B in 20 % of the tetrads of an individual of genotype AB/ab, the percentage of gametes expected to be Ab is:
| 1. | 40 | 2. | 20 |
| 3. | 10 | 4. | 5 |
A dihybrid test cross shows a frequency of recombination of 50 %. The best explanation will be:
| 1. | The two genes are likely to be located on different chromosomes |
| 2. | All of the offspring have combinations of traits that match one of the two parents |
| 3. | The genes are located on sex chromosomes |
| 4. | Abnormal meiosis has occurred |
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A woman receives her X chromosomes from:
1. her mother only
2. her father only
3. both her mother and her father
4. extranuclear DNA in her mother's egg
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The frequency of crossing over between any two linked genes will be:
| 1. | Higher if they are recessive |
| 2. | Dependent on how many alleles there are |
| 3. | Determined by their relative dominance |
| 4. | Proportional to the distance between |
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The disease inheritance pattern exemplified in the given pedigree analysis can be:
| 1. | Hemophilia | 2. | Red-green colour blindness |
| 3. | Phenyl ketonuria | 4. | Polydactyly |
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Consider the following statements:
| I: | People affected by phenylketonuria are unable to convert tyrosine to phenylalanine. |
| II: | Alzheimer’s disease results from the accumulation of amyloid protein plaques in the brain. |
| III: | Klinefelter’s and Turner’s syndromes are the result of nondisjunction of the sex chromosomes in either of the sexes. |
Which of the above statements are true?
| 1. | I and II only | 2. | I and III only |
| 3. | II and III only | 4. | I, II, and III |
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Which of the following would not be a feature seen in a patient with the following karyotype?
1. Many loops on fingertips
2. Congenital heart disease
3. Big and wrinkled tongue
4. Mucus clogging of airways
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Given below is the initial amino acids of the beta chain of a haemoglobin molecule. What will be true about this haemoglobin molecule?
| 1. | The RBCs carrying this molecule will undergo sickling at a high oxygen tension |
| 2. | The RBCs carrying this molecule will undergo sickling at a low oxygen tension |
| 3. | There will be a quantitative decrease in the synthesis of this molecule |
| 4. | This is the normal beta chain of the haemoglobin molecule |
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