Đem lai giữa bố, mẹ thuần chủng khác nhau về 2 cặp gen tương phản thu đc F1 đồng loạt xuất hiện cây quả tròn, mùi thơm cho F1 tự thụ phấn nhận đc F2 có 4000 nghìn cây gồm 4 kiểu hình trong đó kiểu hình quả dài, mùi thơm chiếm số lượng 750 cây biết tương phản với tính trạng quả thơm là ko thơm.

1,Quy luật di truyền nào đã chi phối phép lai trên.

2,Xác định kiểu gen của P và lập sơ đồ lai từ P đến F2.

3,Mỗi kiểu hình còn lại của F2 có bao nhiêu ca thể.

4,Nêu cách xác định kiểu gen cây quả tròn có mùi thơm ở đời F2

Giải phườn trình:

a.\(x^2+9x+20=2\sqrt{3x+10}\)

b.\(\sqrt{2x-3}+\sqrt{5-2x}=3x^2-12x+4\)

c.\(x^2+3x+1=\left(x+3\right)\sqrt{x^2+1}\)

d.\(2x-\sqrt{25-10+x^2}=12\)

Cho biểu thức \(A=\left(\frac{\sqrt{x}+1}{\sqrt{x}-1}-\frac{\sqrt{x}-1}{\sqrt{x}+1}-\frac{\sqrt[]{x}}{x-1}\right):\frac{4\sqrt{x}-8}{1-x}\)

Rút gọn

1.Cho tam giác ABC vuông tại A,đường cao AH, HB= 4cm,HC = 9cm

a.Tính AH,AB,AC

b.D,E là hình chiếu của H trên AB,AC.C/m: EH=2HD

c.Đường thẳng vuông góc với DE tại D và E cắt BC tại M và N

C/m: M là trung điểm của BH

Tính diện tích tứ giác DENM

Cho tam giác ABC,AB= 3cm,AC=4cm,BC=5cm.Từ H kẻ đường thằng song song với AB ,AC cắt AB tại E ,cắt AC tại F

a.Tính AH=?

b.DE.HC=BH.HF

c.\(\frac{AB^2}{AC^2}=\frac{BH}{HC}\)

Cho tam giác ABC có AB= 3cm,AC=4cm,BC=5cm.Từ H lần lượt dựng các đường thẳng // AB,AC cắt AB tại E,cắt AC tại F.

a.Tính AH=?

b.DE.HC=BH.HF

c.\(\frac{AB^2}{AC_{ }^2}=\frac{BH}{HC}\)

1.Cho tam giác ABC vuông tại A,đường cao AH, HB= 2cm,HC = 8cm

a.Tính AH,AB,AC

b.D,E là hình chiếu của H trên AB,AC.C/m: EH=2HD

c.Đường thẳng vuông góc với DE tại D và E cắt BC tại M và N

C/m: M là trung điểm của BH

Tính diện tích tứ giác DENM

Rewrite these sentences using ''so...that'' or ''such....that''.

1.The food was so hot that it burned my tongue

It was.....................................................................

2.There is so much rain that we can't go out.-> There is................................................................

3.He is such a fat boy that every calls him Stuffy.

The boy is..................................................................

4.The milk is so excellent that all the children want some more.

It is................................................................................................

5.The weather was so warm that thay had s walk in the garden.

It was...............................................................................................

6.There were so many people in the hall that we couldn't see him.

There were......................................................................................

7.It was such an exciting match that all the fans shouted loudly.

The match was..............................................................................................

8.They drank such a lot of coffee that they couldn't sleep all night.

They drunk...............................................................................................

9.Alice had such a lot of exercise to do that she coudn't go out.

Alice had..............................................................................................

10.The woman was so poor that she needed everyone's help

She was..............................................................................................

11.The furnire was so expensive that I didn't buy it.

THe furniture was too..............................................................................................

12.It was so late that nothing could be done .-> It was too..............................................................................................

13.The timber was so hard that the carpenter could cut it.

The timber was.............................................................................

14.The meat was so rotten that it had to be thrown away.

It was..............................................................................................

15.They couldn't go sailing as the no one wants very rough.

The sea was too..............................................................................................

16.It is such a dirty restaurant that no one wants to eat there.

The..............................................................................................

17.I can't get my feet into these shoes.-> These shoes..............................................................................................

18.This furniture is so old that it is not worth keeping.

This is ..............................................................................................

19.The bread is stale that we can't eat it.-> The bread isn't..............................................................................................

20.He speaks so slowly that his students get every bored.

He is..............................................................................................

21.The car was so rusty that it couldn't be repair.

The car was too..............................................................................................

22.He was so disgusted at her behaviour that he severed all her contact with her

Such..............................................................................................

23.The child was so afraid that he did behind the sofa.

So..............................................................................................

24.Thay had such a fierce dog that nobody dared to visit them.

So..............................................................................................

25.He is so strong that he can pull a van weighing 2.5 tons.

Such..............................................................................................

Guided Sentence building:Use the given words to make complete meaningful sentences.

1.Kuala Lumpur/largest/city/Malaysia.

2.Islam/official /religion/Indonesia.

3.English/compulsory/subject /schools/Vietnam.

4.They/cry/when/hear/bad news.

5.I/used/live/grandmother/when/I/child.

6.Up to now/I/visit/Da lat /many times/so/know/many places/this romatic city.

7.he/watch/TV/when/phone/ring.

8.While/I/look for/passport/I/find/old photographs/family.

9.Boys/play cards/when/police/come.

10.He/work /Intel/since/move/USA.

11.We/live/this house/since 1986.

12.While/guests/dance/thieves/break into/house/steal/many things.

13.They/walk/park /when/suddenly/rain.

14.She/stay up/late/do/homework/last night/because/she/have/test/tomorrow.

15.They /not/used/living/cold region/country.