Genetikadan masala ishlash

99-masala*. G‘o‘za o‘simligida cheklanmagan hosil shoxi (S) cheklangan hosil shoxi (s) ustidan, changlarning to‘q sariq rangi (P₁) och sariq rangi (p₁) ustidan to‘liq dominantlik qiladi. O‘simlikning antotsian rangi (R^v_st) yashil rangi (r^v_st) ustidan to‘liqsiz dominantlik qiladi.

CHeklanmagan hosil shoxli, changlari och sariq, o‘simliklari yashil rangda bo‘lgan g‘o‘zalar hosil shoxi cheklangan, changlari to‘q sariq, o‘simliklari antotsian bo‘lgan g‘o‘zalar bilan chatishtirilib, F₁ da cheklanmagan hosil shoxli, changlari to‘q sariq, o‘simliklari oraliq rangda bo‘lgan duragaylar olindi. F₁ duragaylarini o‘z-o‘ziga changlantirib olingan ikkinchi avlod (F₂) duragaylarida o‘rganilayotgan belgilar bo‘yicha ajralish kuzatilgan. F₂ da hosil bo‘ladigan genotipik va fenotipik sinflarni aniqlang.

Masalaning echilishi:

Belgi Gen

CHeklanmagan hosil shoxi S

CHeklangan hosil shoxi s

CHanglarning to‘q sariq rangi P₁

CHanglarning och sariq rangi p₁

O‘simliklarning antotsian rangi R^v_st

O‘simliklarning yashil rangi r^v_st

cheklanmagan hosil shoxli, cheklangan hosil shoxli,

changlari och sariq, changlari to‘q sariq,

o‘simlik yashil rangli o‘simlik antotsian rangli

P ♀ SS p₁p₁ r^v_str^v_st X ♂ ss P₁P₁ R^v_stR^v_st

g S p₁r^v_st s P₁ R^v_st

F₁ SsP₁p₁R^v_str^v_st - cheklanmagan hosil shoxli, changlari to‘q sariq , o‘simlik oraliq rangli

cheklanmagan hosil shoxli, cheklanmagan hosil shoxli,

changlari to‘q sariq, changlari to‘q sariq,

o‘simlik oraliq rangli o‘simlik oraliq rangli

P ♀ Ss P₁p₁ R^v_str^v_st X ♂ Ss P₁p₁ R^v_str^v_st

g SP₁R^v_st SP₁R^v_st

SP₁r^v_st SP₁r^v_st

Sp₁R^v_st Sp₁R^v_st

sP₁R^v_st sP₁R^v_st

Sp₁r^v_st Sp₁r^v_st

sP₁r^v_st sP₁r^v_st

sp₁R^v_st sp₁R^v_st

sp₁r^v_st sp₁r^v_st

F₂ 1. SSP₁P₁R^v_stR^v_st = 1 cheklanmagan shoxl., chang to‘q sariq, antotsian rang

2. SSP₁P₁R^v_str^v_st = 2 cheklanmagan shoxl., chang to‘q sariq, oraliq rang

3. SSP₁p₁R^v_str^v_st = 2 cheklanmagan shoxl., chang to‘q sariq, antotsian rang

4. SsP₁P₁R^v_stR^v_st = 2 cheklanmagan shoxl., chang to‘q sariq, antotsian rang

5. SsP₁p₁R^v_stR^v_st = 4 cheklanmagan shoxl., chang to‘q sariq, antotsian rang

6. SsP₁P₁R^v_str^v_st = 4 cheklanmagan shoxl., chang to‘q sariq, oraliq rang

7. SSP₁p₁R^v_str^v_st = 4 cheklanmagan shoxl., chang to‘q sariq, oraliq rang

8. SsP₁p₁R^v_str^v_st = 8 cheklanmagan shoxl., chang to‘q sariq, oraliq rang

9. SSP₁P₁r^v_str^v_st = 1 cheklanmagan shoxl., chang to‘q sariq, yashil rang

10. SSP₁p₁r^v_str^v_st = 2 cheklanmagan shoxl., chang to‘q sariq, yashil rang

11. SsP₁P₁r^v_str^v_st = 2 cheklanmagan shoxl., chang to‘q sariq, yashil rang

12. SsP₁p₁r^v_str^v_st = 4 cheklanmagan shoxl., chang to‘q sariq, yashil rang

13. SSp₁p₁R^v_stR^v_st = 1 cheklanmagan shoxl., chang och sariq, antotsian rang

14. SSp₁p₁R^v_str^v_st = 2 cheklanmagan shoxl., chang och sariq, oraliq rang

15. Ssp₁p₁R^v_stR^v_st = 2 cheklanmagan shoxl., chang och sariq, antotsian rang

16. Ssp₁p₁R^v_str^v_st = 4 cheklanmagan shoxl., chang och sariq, oraliq rang

17. ssP₁P₁R^v_stR^v_st =1 cheklangan shoxl., chang to‘q sariq, antotsian rang

18. ssP₁p₁R^v_stR^v_st = 2 cheklangan shoxl., chang to‘q sariq, antotsian rang

19. ssP₁P₁R^v_str^v_st = 2 cheklangan shoxl., chang to‘q sariq, oraliq rang

20. ssP₁p₁R^v_str^v_st = 4 cheklangan shoxl., chang to‘q sariq, oraliq rang

21. SSp₁p₁r^v_str^v_st = 1 cheklanmagan shoxl., chang och sariq, yashil rang

22. Ssp₁p₁r^v_str^v_st = 2 cheklanmagan shoxl., chang och sariq, yashil rang

23. ssP₁P₁r^v_str^v_st = 1 cheklangan shoxl., chang to‘q sariq, yashil rang

24. ssP₁p₁r^v_str^v_st = 2 cheklangan shoxl., chang to‘q sariq, yashil rang

25. ssp₁p₁R^v_stR^v_st = 1 cheklangan shoxl., chang och sariq, antotsian rang

26. ssp₁p₁R^v_str^v_st = 2 cheklangan shoxl., chang och sariq, oraliq rang

27. ssp₁p₁r^v_str^v_st = 1 cheklangan shoxl., chang och sariq, yashil rang.
F₂ dagi fenotipik sinflar:

1. cheklanmagan shoxlanishli, changi to‘q sariq, antotsian rangli - 9

2. cheklanmagan shoxlanishli, changi to‘q sariq, oraliq rangli - 18

3. cheklanmagan shoxlanishli, changi to‘q sariq, yashil rangli - 9

4. cheklanmagan shoxlanishli, changi och sariq, antotsian rangli - 3

5. cheklanmagan shoxlanishli, changi och sariq, oraliq rangli - 6

6. cheklanmagan shoxlanishli, changi och sariq, yashil rangli - 3

7. cheklangan shoxlanishli, changi to‘q sariq, antotsian rangli - 3

8. cheklangan shoxlanishli, changi to‘q sariq, oraliq rangli - 6

9. cheklangan shoxlanishli, changi to‘q sariq, yashil rangli - 3

10. cheklangan shoxlanishli, changi och sariq, antotsian rangli - 1

11. cheklangan shoxlanishli, changi och sariq, oraliq rangli - 2

12. cheklangan shoxlanishli, changi och sariq, yashil rangli - 1

Ikkita belgi bo‘yicha to‘liq dominantlik va bitta belgi bo‘yicha to‘liqsiz dominantlik holatida 12 ta fenotipik sinflar hosil bo‘ladi. Ularning nisbati 9:18:9:3:6:3:3:6:3:1:2:1. Genotipik sinflar soni 27 ta.