Word: defectiveness
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Their importance to science is that they have a unique hereditary defect of the sort which crops out occasionally in nature but which human investigators cannot produce at will. Some disturbance in the rat chromosomes (heredity carriers in the germ plasm) prevents their soft, prenatal cartilage from developing into a normal skeleton. The young appear normal for two weeks, then become bandy-legged as if suffering from rickets. Usually they die at the age of four to five weeks, with soft, collapsed ribs and emphysema of the lungs (air leakage into the spaces of the connective tissue...
...strain can be perpetuated because, according to the Mendelian three-to-one ratio, only one in four of the young rats manifests the lethal defect. Four of the females littered last week, and the colony now numbers about 30. Since zoologists by studying such anomalies can cast more light on the mystery of heredity transmission in the chromosomes, several U. S. scientists have expressed great interest in Dr. Dunn's new boarders. He plans soon to ship specimens to other laboratories...
Last year, long before the recent war scare, Dr. Dunn received from England a consignment of mice with a hereditary defect. Their teeth grew backward into their jaws, causing early death from malnutrition. Reason for this shipment was the same: fear of destruction by bombs...
...other hand it was shown that those who have exhibited a strong determination to conquer this defect have through regular and consistent efforts achieved success...
...Surest Way. To Secretary of Agriculture Wallace AAA has recently come to stand for ache, agony and anguish. In defense of AAA he has argued that present low prices are due more to bumper weather (even the Dust Bowl bloomed this year) than to any serious defect in the Act. But in spite of the most far reaching crop control laws ever enacted, all three major U. S. crops are in trouble. Wheat, with a near-record crop of 940,000,000 bushels and a whopping 300.000,000 bushel carryover in prospect for next year, has stumbled...