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truongngocanh1230
2 năm trước
xét 2 cặp gen (A,a và B,b) nằm trên 2 cặp NST thường khác nhau. Biết mỗi cặp gen quy định 1 tính trạng, alen trội là trội hoàn toàn, có bao nhiêu phép lai cho đời con phân ly kiểu hình theo tỉ lệ 3:1? (không xét đến phép lai thuận nghịch)
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Giúp mình với,chỉ 1 câu hỏi thui The term "virus" is derived from the Latin word for poison or slime. It was originally applied to the noxious stench emanating from swamps that was thought to cause a variety of diseases in the centuries before microbes were discovered and specifically linked to illness. But it was not until almost the end of the nineteenth century that a true virus was proven to be the cause of a disease. The nature of viruses made them impossible to detect for many years even after bacteria had been discovered and studied. Not only are viruses too small to be seen with a light microscope, they also cannot be detected through their biological activity, except as it occurs in conjunction with other organisms. In fact, viruses show no traces of biological activity by themselves. Unlike bacteria, they are not living agents in the strictest sense. Viruses are very simple pieces of organic material composed only of nucleic acid, either DNA or RNA, enclosed in a coat of protein made up of simple structural units. Question 1. Before microbes were discovered it was believed that some diseases were caused by__________. A. germ-carrying insects B. certain strains of bacteria C. foul odors released from swamps D. slimy creatures living near swamps

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