Genetikadan masala ishlash

157-masala*. YAlang‘och urug‘li (GS) g‘o‘za o‘simligi boshqa bir yalang‘och urug‘li (GS) o‘simlik bilan chatishtirilib F₁ da yalang‘och urug‘li (GS) duragaylar olindi. F₁ duragaylarini o‘zidan changlantirib, F₂ da 49:15 nisbatda yalang‘och urug‘li (GS) va mikropilyar tuklanishli (MS) duragaylar olindi. Ota-ona sifatida olingan g‘o‘za o‘simliklarining genotipini aniqlang.

Masalaning echilishi:

ikkinchi avlodda mikropilyar tuklanishli (MS) duragaylarning chiqishi ota-ona o‘simliklarining birida dominant ingibitor va mikropilyar tuklanishni rivojlantiruvchi asosiy genlar mavjudligini ko‘rsatadi.

GS GS

P ♀ II Ft₁Ft₁Ft₂Ft₂ fcfc X ♂ ii ft₁ft₁ft₂ft₂ fcfc

g I Ft₁Ft₂ fc i ft₁ft₂ fc

F₁ Ii Ft₁ft₁Ft₂ft₂ fcfc - GS
GS GS

P ♀ Ii Ft₁ft₁Ft₂ft₂ fcfc X ♂ Ii Ft₁ft₁Ft₂ft₂ fcfc

g I Ft₁Ft₂ fc I Ft₁Ft₂ fc

I Ft₁ft₂ fc I Ft₁ft₂ fc

I ft₁Ft₂ fc I ft₁Ft₂ fc

I ft₁ft₂ fc I ft₁ft₂ fc

i Ft₁Ft₂ fc i Ft₁Ft₂ fc

i Ft₁ft₂ fc i Ft₁ft₂ fc

i ft₁Ft₂ fc i ft₁Ft₂ fc

i ft₁ft₂ fc i ft₁ft₂ fc

F ₂ 1. II Ft₁Ft₁Ft₂Ft₂ fcfc – 1

2. II Ft₁Ft₁Ft₂ft₂ fcfc – 2

3. II Ft₁ft₁Ft₂Ft₂ fcfc – 2

4. II Ft₁Ft₁ft₂ft₂ fcfc – 1

5. II ft₁ft₁Ft₂Ft₂ fcfc – 1 GS (16)

6. II Ft₁ft₁Ft₂ft₂ fcfc – 4

7. II Ft₁ft₁ft₂ft₂ fcfc – 2

8. II ft₁ft₁Ft₂ft₂ fcfc – 2

9. II ft₁ft₁ft₂ft₂ fcfc – 1

10. Ii Ft₁Ft₁Ft₂Ft₂ fcfc –2

11. Ii Ft₁Ft₁Ft₂ft₂ fcfc –4

12. Ii Ft₁ft₁Ft₂Ft₂ fcfc –4

13. Ii Ft₁Ft₁ft₂ft₂ fcfc –2 GS (32)

14. Ii ft₁ft₁Ft₂Ft₂ fcfc – 2

15. Ii Ft₁ft₁Ft₂ft₂ fcfc – 8

16. Ii Ft₁ft₁ft₂ft₂ fcfc – 4

17. Ii ft₁ft₁Ft₂ft₂ fcfc – 4

18. Ii ft₁ft₁ft₂ft₂ fcfc – 2

19. ii Ft₁Ft₁Ft₂Ft₂ fcfc –1 n-MS

20. ii Ft₁Ft₁Ft₂ft₂ fcfc – 2 p-MS

21. ii Ft₁ft₁Ft₂Ft₂ fcfc – 2 p-MS

22. ii Ft₁Ft₁ft₂ft₂ fcfc – 1 m-MS

23. ii ft₁ft₁Ft₂Ft₂ fcfc – 1 m-MS

24. ii Ft₁ft₁Ft₂ft₂ fcfc – 4 m-MS

25. ii Ft₁ft₁ft₂ft₂ fcfc – 2 nz-MS

26. ii ft₁ft₁Ft₂ft₂ fcfc – 2 nz-MS

27. Ii ft₁ft₁ft₂ft₂ fcfc – 1 rGS

48 (dominant GS) + 1 (retsessiv GS) = 49 ta GS

1 n-MS + 4 p-MS + 6 m-MS + 4 nz-MS = 15 MS. Nisbat 49 : 15.

158-masala. YAlang‘och urug‘li (GS) g‘o‘za o‘simligi OS tip tuklanishli g‘o‘za bilan chatishtirilib, F₁ da yalang‘och urug‘li duragaylar olindi. F₂ da esa 3:1 nisbatda yalang‘och urug‘li (GS) va OS tip tuklanishli duragaylar olindi. Ota-ona o‘simliklarning genotipini aniqlang.

159-masala. O‘rtacha mikropilyar tuklanishli (m-MS) g‘o‘za ikkinchi bir o‘rtacha mikropilyar tuklanishli (m-MS) g‘o‘za bilan chatishtirilib, F₁ da o‘rtacha mikropilyar tuklanishli duragaylar olindi. F₂ da esa 15:1 nisbatda mikropilyar tuklanishli (MS) va yalang‘och urug‘li (GS) duragaylar olindi. Ota-ona sifatida olingan g‘o‘zalarning genotipini aniqlang.

160-masala. OS tip tuklanishli g‘o‘za o‘rtacha mikropilyar tuklanishli (m-MS) g‘o‘za bilan chatishtirilib, F₁ da OS tip tuklanishli duragaylar olindi. F₂ da esa 1:4:1:10 nisbatda yalang‘och urug‘li (GS) : juda kichik mikropilyar tuklanishli (nz-MS) : o‘rtacha mikropilyar tuklanishli (m-MS) : OS tip tuklanishli duragaylar olindi. Boshlang‘ich g‘o‘za o‘simliklarining genotipini aniqlang.

161-masala. Ikkita har-xil juda kichik mikropilyar tuklanishli (nz-MS) g‘o‘za o‘simliklari o‘zaro chatishtirilib, keyingi avlodda 1:2:1 nisbatda yalang‘och urug‘li (GS) : juda kichik mikropilyar tuklanishli (nz-MS) : OS tip tuklanishli duragaylar olindi. Boshlang‘ich g‘o‘zalarning genotipini aniqlang.

162-masala. Ikkita har-xil juda kichik mikropilyar tuklanishli (nz-MS) g‘o‘za o‘simliklari o‘zaro chatishtirilib, keyingi avlodda 4:8:3:1 nisbatda yalang‘och urug‘li (GS) : juda kichik mikropilyar tuklanishli (nz-MS) : o‘rtacha mikropilyar tuklanishli (m-MS) : to‘liq tuk bilan qoplangan (OS) duragaylar olingan. Boshlang‘ich g‘o‘za o‘simliklarining genotipini aniqlang.