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Question
Albinism is known to be due to an autosomal recessive mutation. The first child of a couple with normal skin pigmentation was an albino. What is the probability that their second child will also be an albino?
Options
100%
25%
50%
75%
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Solution
25%
Explanation:
Since albinism is an autosomal recessive trait, the parents must both be heterozygous carriers (e.g., Aa) to have a child who is albino (aa). The cross between two carriers (Aa × Aa) yields a 25% chance of an albino offspring (aa), as the inheritance of each child is an independent event.
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Answer the following question.
Two children, A and B aged 4 and 5 years respectively visited a hospital with a similar genetic disorder. The girl A was provided enzyme-replacement therapy and was advised to revisit periodically for further treatment. The girl, B was, however, given a therapy that did not require revisit for further treatment.
Why did the treatment provided to girl A required repeated visits?
Match List I with List II.
| List I | List II | ||
| A. | A pair of chromosomes extra with diploid | i) | monosomy |
| B. | One chromosome extra to the diploid | ii) | tetrasomy |
| C. | One chromosome loses from diploid | iii) | trisomy |
| D. | Two individual chromosomes lose from diploid | iv) | double monosomy |
Rate of mutation is affected by ______.
Match list I with list II.
| List I | List II |
| A. A pair of chromosomes extra with diploid | i) Monosomy |
| B. One chromosome extra to the diploid | ii) Tetrasomy |
| C. One chromosome loses a diploid | iii) Trisomy |
| D. Two individual chromosomes lose their diploid | iv) Double chromosome |
Match list I with list II.
| List I | List II |
| A. A pair of chromosomes extra with diploid | i) monosomy |
| B. One chromosome extra to the diploid | ii) tetrasomy |
| C. One chromosome loses from diploid | iii) trisomy |
| D. Two individual chromosomes lose from diploid | iv) double monosomy |
Which type of mutation involves the substitution of a single base pair?
Which of the following is also called a 'gross mutation' or 'macro mutation'?
Which human genetic condition is characterized by trisomy 21 and results from chromosomal mutation?
Which physical mutagens are classified as ionizing radiation?
How does DDT resistance in mosquitoes exemplify the evolutionary importance of mutations?
