a. Một cá thể chứa 3 cặp gen dị hợp Aa, Bb, Dd nằm trên NST thường. Cá thể này có thể có kiểu gen như thế nào trong trường hợp: - Ba cặp gen Aa, Bb, Dd nằm trên 3 cặp NST tương đồng khác nhau. -Hai cặp Aa, Bb cùng nằm trên 1 cặp NST tương đồng, liên kết hoàn toàn, cặp Dd nằm trên NST tương đồng khác. - Cả ba cặp gen cùng nằm trên 1 cặp NST tương đồng, liên kết hoàn toàn. b. Cơ thể có kiểu gen AB/ab tự thụ qua 3 thế hệ. Xác định tỉ lệ kiểu gen ở thế hệ thứ 3? Biết các gen liên kết hoàn toàn

giải hộ hpt $\left \{ {{xy=120} \atop {(x+2)(y-3)=120}} \right.$

Làm hộ mình với ạ!! Mình cần gấp lắm ạ

Vì sao chim bồ câu chỉ đẻ 2 trứng cho mỗi lứa đẻ còn thằn lằn lại đẻ 5-10 trứng? help mee~

1Trong một ngày,phần xưởng thứ nhất làm được 1872 sản phẩm,phân xưởng thứ hai làm được 2976 sản phẩm.Biết rằng mỗi công nhân trong một ngày làm được 8 sản phẩm .Hỏi trong ngày đó cả hai phân xưởng có bao nhiêu công nhân làm việc? 2.Tính chu vi tấm bìa hình chữ Nhật có chiều dài 1dm,chiều rộng kém chiều dài 3cm.

Tính giới hạn lim(n căn n-2 căn(n+1))

Cho tam giác ABC. Ở phía ngoài tam giác đó vẽ các tam giác vuông cân tại A là ABD và ACE a)Chứng minh CD = BE và CD vuông góc với BE b)BD^2+CE^2=BC^2+DE^2 c)Đường thẳng qua A vuông góc DE, cắt BC tại K. CM: K là trung điểm của BC

lập dàn ý cảnh đón giao thừa của gia đình em lưu ý là LẬP DÀN Ý

You drink too much coffee, that's why you can't sleep ->if you You press thí button to stop the machine ->if Make me some coffee,and i'll give you one of my biscuits ->if Working so much will make you tired ->if What would you do if you found some buried treasure -> if you were I might be late.If so,Start without me ->if i Susan felt sick because she ate 4 cream cakes ->if

Rewrite the following sentences (1.0 pt) The cat jumped through the window. → The boy saw………………………………………………………….. They allowed him to write a letter to his wife. → They let ……………………………………………………………….. She wants to play the piano. → She enjoys …………………………………………………………… After she had done homework she went to school. → Before………………………………………………………………….. Put the verbs into their correct form (1.0 pt) I expected (invite) ………………… to the party, but I wasn’t You must keep (practise) ………………… on computer It’s a pleasure (see) …………… you again after so long She was frightened of ……………….( rob) by a stranger. Read the text carefully and then choose the best option When I was a student, I had a summer job in an expensive restaurant in Glasgow. One day we were expecting forty members of a football team for lunch. I was given the job of peeling potatoes. I thought I was managing quite well with my small knife until the owner appeared to see how I was getting on. She was amazed that I was using a knife and asked why I wasn’t using the potato peeler. I had no idea what a potato peeler was so she let me into a small room behind the kitchen. There, on the table, was a small machine like the rubbish bins some people have in their bathrooms. She explained as if to a small child that I had to put the potatoes in, close the lid and press the button. When she came back ten minutes later, I told her I thought it was quicker to do it by hand. She asked what I meant. “Well, they aren’t ready yet,” I replied. You can imagine how I felt when she lifted the lid and took out the potatoes the size of peas. The potato peeler was not automatic. The story happened in ………….. winter B. a small restaurant C. summer D. a football club How did the owner of the restaurant explain how to use the potato peeler? very carelessly B. very angrily C. very impatiently D. very carefully The potato peeler ………….. was a rubbish bin B. could stop when the potatoes were ready was small D. was very difficult to use What can you infer from the story? Football teams often had lunch in this restaurant. The tables in this restaurant were only enough for forty guests. Some the potato peelers were automatic The student had no experience in working in a restaurant. Rosa and Luis are having a party, too. But it is not a …………(19)………. party. It is an anniversary party. Fifty years ago, Rosa and Luis got …………(20)………… Today their family and friends are giving them a party. Everyone ………(21)………. some cakes and says ” Happy Anniversary!” to Rosa and Luis. People also give cards and …………(22)………….. to the anniversary couple. A. birthday B. anniversary C. party D. wedding A. married B. influenced C. interested D. ready A. ate B. eats C. eating D. eat A. cards B. gifts C. parties D. cakes