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phuongkyo100
2 năm trước
Ở đậu Hà lan tính trạng hạt vàng (A) là trội hoàn toàn so với tính trạng hạt xanh (a) Vàng x Xanh  F1 : 1 vàng : 1 xanh Sau đó cho F1 tạp giao  F2 : ( tỉ lệ KG , KH trong tổng số phép lai ) sẽ như thế nào ? Biết gen quy định tính trạng nằm trên NST ri­êng.
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Vietnam's New Year is celebrated according to the Lunar calendar. It is officially known as Tet Nguyen Dan, or Tet. It occurs between January twenty-first and February nineteenth. Vietnamese people usually make preparations for the holiday several weeks beforehand. They tidy their houses, cook special food and make offerings. On the New Year's Eve, people sit up to midnight to see the New Year in, then they put on new clothes and give one another this greetings of the season. The first three days are the most important. Vietnamese people believe that how people act during those days will influence the whole year. 1. When does the Vietnam's New Year occur? ............................................... 2. What do people do to prepare for the holiday? ............................................... 3. Why do people sit up to midnight? ............................................... 4. Are the first three days of the festival believed to be very important? ...............................................

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