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प्रश्न
Name the kind of diseases/disorders that are likely to occur in humans if
(i) mutation in the gene that codes for an enzyme phenyl alanine hydrolase occurs,
(ii) there is an extra copy of chromosome 21,
(iii) the karyotype is XXY.
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उत्तर
(i) Phenylketonuria is the disorder that occur in humans due to the mutation in the gene (phenylalanine) that codes for an enzyme phenylalanine hydroxylase.
(ii) Down syndrome is the disorder that occur in humans if there is an extra copy of chromosome no. 21.
(iii) Klinefelter's syndrome is the disorder that occur in humans if the karyotype is XXY.
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संबंधित प्रश्न
List four points of significance of reproductive health in a society. Name any two areas related to the reproductive health which have improved over the past 50 years in our country.
What are the three types of methods used for birth control (or regulating child birth)? Give one example of each type.
What is the name of surgical method of birth control (or preventing pregnancy) which is carried out in men?
One of the following is a surgical method which prevents the sperms from reaching the ovum and pregnancy does not occur. This method is :
(a) IUCD
(b) vasectomy
(c) condom
(d) tubectomy
What are Sexually Transitted Diseases (STD)? List two viral and two bacterial STDs.
Explain one application of the following:
Amniocentesis
‘Saheli’ a new oral contraceptive developed by ______.
Explain how, offspring and parents of organisms reproducing sexually have the same number of chromosomes?
Observe the chart and graph given in the figure carefully and answer the following questions.
| Age in Years |
% of full height | |
| Boys | Girls | |
| 8 | 72% | 77% |
| 9 | 75% | 81% |
| 10 | 78% | 84% |
| 11 | 81% | 88% |
| 12 | 84% | 91% |
| 13 | 88% | 95% |
| 14 | 92% | 98% |
| 15 | 95% | 99% |
| 16 | 98% | 99.5% |
| 17 | 99% | 100% |
| 18 | 100% | 100% |
- Which of the line represents the height of boys?
- Which line represents the height of girls?
- What is the difference between the pattern of increase in the height of boys and girls?
- Is this pattern true for each individual?
Where was "Saheli" developed?
