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tranyenha23
2 năm trước
Trong một phép lai giữa hai cây đậu Hà Lan hạt vàng với nhau thì đời con F1 xuất hiện cây đậu hạt xanh. Biết rằng mỗi gen quy định một tính trạng , tính trạng trội là trội hoàn toàn, quá trình giảm phân không xảy ra đột biến. Hãy xác định kết quả gen và kiểu hình ở F1 ở phép lai trên ?
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3/.Many people think that student have an easy life: we only work a few hours a day and have long vacations. They don't know we have to work hard at school and at home. Take a look at a typical grade 7 student like Hoa. She has five periods a day, six days a week. That is about 20 hours a week-fewer hours than any worker. But that is not all. Hoa is a keen student and studies hard. She has about 12 hours of homework every week. She also has to review her work before tets. This makes her working week about 45 hours.This is more than some workers.Students like Hoa are definitely not lazy! 1/why do some people think that students have an easy life ? 2/how many hours a week does Hoa work ?Is this fewer than most workers? 3/How many hours a week do you work? Is that more or fewer hours than Hoa? 4/Does the write think students are lazy?

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