Reason for trisomy in Down's syndrome is:
1. Non-disjunction during sperm formation
2. Non-disjunction during egg formation
3. Non-disjunction at the time of egg or sperm formation
4. Addition of one extra chromosome during mitosis
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyMental retardation in man occurs due to:
1. Loss of one X chromosome
2. Addition of one X chromosome
3. Slight growth in Y
4. Overgrowth in Y
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyMangolian idiots are due to trisomy in the 21st chromosome is called:
1. Down's syndrome
2. Turner's syndrome
3. Kleinfelters syndrome
4. Triplex syndrome
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyMale XX and female XY sometime occur due to:
1. Deletion
2. Transfer of segments in X and Y chromosomes
3. Aneuploidy
4. Hormonal imbalance
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWhich of the following is the correct match:
1. Down Syndrome = 21st Chromosome
2. Sickel cell anaemia = X – Chromosome
3. Haemophilia = Y – Chromosome
4. Parkinson Disease = X & Y Chromosomes
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyDown's syndrome is caused by an extra copy of chromosome number 21. What percentage of offspring produced by an affected mother and a normal father would be affected by this disorder:
1. 100%
2. 75%
3. 50%
4. 25%
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA woman with 47 chromosomes, due to three copies of chromosome 21, is characterized by:
1. | Turner syndrome | 2. | Down syndrome |
3. | Superfemaleness | 4. | Triploidy |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology