Is the chromosome number of zygote, embryonal cells and adult of a particular organism always constant? How is the constancy maintained in these three stages?
The number of the chromosomes in parents and offspring remains constant due to halving of chromosomes during the gamete formation and this takes place by the process of meiosis. Gametes contain only half of the amount of DNA from both the parents as compared to the normal cell. And, when the female gamete combines with the male gamete it will form a new zygote after the fertilization process and chromosomes become equal to that of somatic cells. And then the mitosis process takes place for the rest of the stages of the life cycle.
You are given kerosene, turpentine and water. In which of these does the light travel fastest? Use the information given in Table 10.3.
| Material medium |
Refractive index |
Material medium |
Refractive index |
| Air | 1.0003 | Canada Balsam |
1.53 |
| Ice | 1.31 | ||
| Water | 1.33 | Rock salt | 1.54 |
| Alcohol | 1.36 | ||
| Kerosene | 1.44 | Carbon disulphide |
1.63 |
| Fused quartz |
1.46 | ||
| Turpentine oil |
1.47 | Ruby | 1.71 |
| Benzene | 1.50 | Sapphire | 1.77 |
| Crown glass |
1.52 | Diamond | 2.42 |
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Welcome to the NCERT Solutions for Class 10 Science - Chapter . This page offers a step-by-step solution to the specific question from Excercise 0 , Question 39: Is the chromosome number of zygote, embryonal cells and adult of a particular organism always consta....
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