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प्रश्न
Explain how, offspring and parents of organisms reproducing sexually have the same number of chromosomes?
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उत्तर
Sexually reproducing organisms produce gametes through meiosis as a result they receive only half the number of chromosomes and half the amount of DNA as compared to the non reproductive body cells.When these gametes from two individuals combine during sexual reproduction to form a new individual, the original number of chromosomes and the DNA content in the new generation are restored.
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संबंधित प्रश्न
Your school has been selected by the Department of Education to organize and host an interschool seminar on “Reproductive Health – Problems and Practices”. However, many parents are reluctant to permit their wards to attend it. Their argument is that the topic is “too embarrassing.” Put forth four arguments with appropriate reasons and explanation to justify the topic to be very essential and timely.
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What is the name of surgical method of birth control in human females in which the oviducts are cut and ligated (tied) at both ends?
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Which method of contraception prevents fertilised egg from being implanted in the uterus?
What is the name of surgical method of birth control (or preventing pregnancy) which is carried out in women?
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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?
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