Value Based Questions in Science for Class 10 Chapter 9 Heredity and Evolution
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Theory of natural selection stresses upon struggle for existence and survival of the fittest. How is this applicable to us ?
Struggle is natural to our existence. A toddler will struggle to get up and walk. Every body struggled to get admission in a good school. There is struggle to get selected in the school team for various sports and extracurricular activities. Every student works hard to score well in the examination. People struggle to get job after finishing the studies. There is struggle to remain fit, and so on. In the struggle for any aspect of life only the fittest are able to win and obtain what they are aspiring whether in sports team or merit in studies or a job after studies.
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Everybody cannot be topper or a good sportsperson. But everybody has some good quality where he or she can excel whether it is painting, gardening, singing, playing instruments, dancing, a good salesman, a good entertainer or event management. What is social impact of emigration and acclimitisation ?
A person emigrates to another state or country in order to get better opportunities, better perks and better living. Initially the person calls his home more frequently and also visits his place as often as possible. However, slowly he mixes up in the society where he works and lives. As acclimitisation increases, his calls and visits to his home become less frequent, His childern who are brought up in a different environment are unable to adjust themselves in the family and his old circle of relations. This disinterest in visiting fathers old home and family adds to inability of the person to go home as frequendy. In the new area the children grow up in a different set up. Their attitude and perceptions are often at variance with that of the parents. Clashes may occur. Ultimately the emigrant feels quite unsatisfied, dejected but helpless.
Recessive traits do not express their effect in the presence of dominant traits. How is this fact useful in overcoming hereditary diseases in the families ?
Most hereditary diseases are caused by recessive traits in the homozygous state. Homozygosity increases if marriages are performed within relatives of upto 4-6 generations. In heterozygous state the recessive traits remain suppressed due to presence of dominant traits. Therefore, for overcoming hereditary diseases, it is important that individuals should remain heterozygous. This is possible only through out crossing or marriages between unrelated individuals or not having common ancestors on either side for 4-6 generations.
Raghu often taunts his wife for having only daughters and no son. As a student of biology how will you convince Raghu that his wife has no role in giving birth to girls only ?
By telling Raghu that sex of the child is determined at the time of conception. Women are homogametic, i.e., they produce only one type of ova (22 + X). Males are heterogametic. They produce two types of sperms, androsperms (22 + Y) and gynosperms (22 + X). The two types of sperms are formed in equal proportion. It is chance factor that gynosperm fuses with the ovum (22 + X and 22 + X) resulting in the female child. The same chance is possible for the second and even the third time. In any case, for the sex of the child, only the father is responsible.
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