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Rapid Growth In Genetics: The second period of rapid growth in genetics began after World War II and continues to this day. In this period, geneti¬cists have sought to understand the mechanisms of genetics on a finer scale than had earlier been possible. They have looked for the answers to such questions as: Of what is a gene made? How does it affect the rest of the cell? What turns it on or off? Most of these questions have now been answered, at least in part, and the answers have turned out to entail as much chemi¬cal as biological information.
In 1950, when the more recent period of rapid growth in genetics began, it appeared likely that all of the detailed in¬structions needed to produce an organism, even one as com¬plicated as a human being, must be contained in the two sets of genes that the organism inherits from its parents. One set of genes comes from the unfertilized egg of the mother, the other from the sperm of the father.See Also Population Growth Was Attributable:Since World War II, Greece has been spared the population explosion that has characterized many developing nations. But its low annual population growth was attributable in large part to renewed emigration. The number of emigrants rose from 30,000 in 1955 to 117,000 in 1965. The chief recipients were the United States, Canada, Australia, and especially West Germany.
The growth of populations of predatory ani-als is frequently affected by the growth of the prey. Very often the two follow a cyclical pattern. When the population size of the prey is high, the predators flourish and grow rapidly. As the pre¬dator population grows, the number of prey is rapidly diminished. The predators begin to die from a lack of food, and the decrease in the num¬ber of predators permits the prey population to increase again. The same kind of cycle is ob¬served among the animal population as a result of epidemics, caused by pathogenic bacteria or liruses.
On The Other Hand See Hap¬hazard Growth:The basic financing should be the least of the diffi¬culties, for we rebuild the United States con¬tinuously. It is a matter, primarily, of planning for the common good instead of allowing hap¬hazard growth for the temporary benefit of a few. Such action must come from the people; it cannot be imposed from above. City planning today is, therefore, an integral part of the demo¬cratic process.
Human Hazard.—The human hazard from a rattlesnake bite varies greatly with the species. Xot only do differences in adult size affect the quantity of venom and the depth of penetration of the fangs, but there are extensive differences in the toxicity and physiological effects of the venom itself. Although no rattlesnake is inher¬ently vicious, some are more ready than others to assume a defensive attitude and strike at a human intruder. On the defensive a rattlesnake raises the forepart of its body off the ground in a loose 5-shaped curve. |
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