ПОМОГИТЕ СРОЧНО Голубые фиалки опылялись белыми в поколении ф1 голубой цвет исчез найти поколение ф1 и ф2

ПОМОГИТЕ СРОЧНО Голубые фиалки опылялись белыми в поколении ф1 голубой цвет исчез найти поколение ф1 и ф2
- Предмет:
  Биология
- Автор:
  violetkelley
- 5 лет назад

Ответы 1

Белый цвет - АГолубой цвет - аP1:(жен.знак)aa x (муж.знак) ААG: a AF1: AaСкрещиваем потомство.P2: (жен.знак)Аа x (муж знак) АаG: A a A aF2: AA Aa Aa aaОтвет: первое поколение получилось только с белым цветом. второе поколение: расщепление по фенотипу 3:1(присутствуют фиалки как с белой,так и с голубой окраской).
- Автор:
  kevinnelson
- 5 лет назад
- 0
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Test 4

Choose the correct tense and form of the verbs.

1. I... down from the stairs and now I’ve got a broken arm.

a. fell

b. was falling

c. had fallen

2. It... when the accident happened.

a. rained

b. was raining

c. had rained

3. We visited this place for the first time — we ... there before.

a. weren’t

b. haven’t been

c. hadn’t been

4. When I... in, everyone was talking about me.

a. came

b. was coming

c. had come

5. He ... since last year.

a. didn’t smoke

b. hasn’t smoked

c. hadn’t smoked

6. As soon as I got home I... to bed.

a. went

b. was going

c. had gone

7. We ... each other since we were children.

a. didn’t meet

b. haven’t met

c. hadn’t met

8. I... television at 2 a.m. this morning.

a. watched

b. was watching

c. have watched

9. Don’t worry. He ... his exam today.

a. passed

b. was passing

c. has passed

10. I... to my work when I remembered I didn’t have my key.

a. went

b. was going

c. have gone already

11. I heard music from the next flat — the party... already.

a. started

b. has started

c. had started

12. The road was quiet when I... my car.

a. drove

b. was driving

c. has driven

13. I knew he ... his son many years ago.

a. found

b. has found

c. had found

14. .. . you ... what to do on Sunday?

a. Did ... decide

b. Have ... decided

c. Had ... decided

15. Mike was listening to music so he ... the telephone.

a. didn’t hear

b. wasn’t hearing

c. hasn’t heard

16. We ... already ... this topic.

a. did ... studied

b. were ... studying

c. have... studied

17. I... my job when it was very late.

a. left

b. was leaving

c. had left

18. ... you ... your homework when your mother came?

a. Did... do

b. Have ... done

c. Had... done

19. When she was a child, she ... like her mother.

a. looked

b. was looking

c. has looked

20. When I opened the door, they ... a game.

a. played

b. were playing

c. have played

21. He ... here for many years but he doesn’t know the language well,

a. lives

b. has lived

c. has been living

22. We ... this grammar rules topic when the teacher gave us the test.

a. learnt

b. had learnt

c. had been learning

23. I didn’t recognize her because we ... each other for ages.

a. didn’t see

b. haven’t seen

c. hadn’t seen

24. The president... at the head of the country for two years when he was shot.

a. was

b. had been

c. has been

25. While he ... the TV programme he saw a familiar face.

a. was watching

b. watched

c. had watched
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ПОМОГИТЕ СРОЧНО Голубые фиалки опылялись белыми в поколении ф1 голубой цвет исчез найти поколение ф1 и ф2

Ответы 1

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