Genetikadan masala ishlash

96-masala. G‘o‘za o‘simligida cheklanmagan hosil shoxi (S) cheklangan hosil shoxi (s) ustidan, gulyonbarglarining yuraksimon shakli (Fg) ingichka shakli (fg) ustidan, gultojibarglarining to‘q sariq rangi (Y₁) och sariq rangi (y₁) ustidan to‘liq dominantlik qiladi.

Quyidagi genotipli organizmlar chatishtirilganda keyingi avlodda olinadigan organizmlarning genotip va fenotipini aniqlang:

1) SS Fg Fg Y₁Y₁ x ss fg fg y₁y₁; 2) Ss Fg fg y₁y₁ x ss fg fg y₁y₁;

3) Ss Fg fg Y₁y₁ x ss fg fg y₁y₁; 4) Ss Fg fg Y₁y₁ x Ss Fg fg Y₁y₁.

97-masala*. G‘o‘za o‘simligida cheklanmagan hosil shoxi (S) cheklangan hosil shoxi (s) ustidan to‘liq, o‘simlikning antotsian rangi (Rp) yashil rangi (rp) ustidan to‘liqsiz, qo‘ng‘ir tola (Fr^Br) oq tola (Fr^br) ustidan to‘liqsiz dominantlik qiladi. CHeklanmagan hosil shoxli, antotsian rangli va tolasi qo‘ng‘ir bo‘lgan g‘o‘za o‘simligi har uchchala belgi bo‘yicha retsessiv gomozigotali boshqa g‘o‘za o‘simligi bilan chatishtirilib, F₁ da cheklanmagan hosil shoxli, oraliq rangli va tolasi novvot rang bo‘lgan duragaylar olindi. F₁ duragaylari o‘z-o‘zi bilan changlantirilib F₂ duragaylari olindi. F₂ da hosil bo‘ladigan fenotipik va genotipik sinflarni aniqlang.

Masalaning echilishi:

cheklanmagan hosil shoxi, cheklangan hosil shoxi,

antotsian rang, qo‘ng‘ir tola yashil rang, oq tola

P ♀ SS RpRp Fr^Br Fr^Br X ♂ ss rprp Fr^br Fr^br

g S Rp Fr^Br s rp Fr^br

F₁ Ss Rprp Fr^Br Fr^br - cheklanmagan hosil shoxi, oraliq rang, novvot rang tola
cheklanmagan hosil shoxi, cheklanmagan hosil shoxi,

oraliq rang, novvot rang tola oraliq rang, novvot rang tola

P ♀ Ss Rprp Fr^Br Fr^br X ♂ Ss Rprp Fr^Br Fr^br

g S Rp Fr^Br S Rp Fr^Br

S Rp Fr^br S Rp Fr^br

S rp Fr^Br S rp Fr^Br

s Rp Fr^Br s Rp Fr^Br

S rp Fr^br S rp Fr^br

s Rp Fr^br s Rp Fr^br

s rp Fr^Br s rp Fr^Br

s rp Fr^br s rp Fr^br

F₂ 1. SS RpRp Fr^Br Fr^Br - 1 cheklanmagan shoxli, antotsian, qo‘ng‘ir tola;

2. SS RpRp Fr^Br Fr^br - 2 cheklanmagan shoxli, antotsian, novvot rang tola;

3. SS Rprp Fr^Br Fr^Br - 2 cheklanmagan shoxli, oraliq rang, qo‘ng‘ir tola;

4. Ss RpRp Fr^Br Fr^Br - 2 cheklanmagan shoxli, antotsian, qo‘ng‘ir tola;

5. Ss Rprp Fr^Br Fr^Br - 4 cheklanmagan shoxli, oraliq rang, qo‘ng‘ir tola;

6. Ss RpRp Fr^Br Fr^br - 4 cheklanmagan shoxli, antotsian, novvot rang tola;

7. SS Rprp Fr^Br Fr^br - 4 cheklanmagan shoxli, oraliq rang, novvot rang tola;

8. Ss Rprp Fr^Br Fr^br - 8 cheklanmagan shoxli, oraliq rang, novvot rang tola;

9. SS RpRp Fr^br Fr^br - 1 cheklanmagan shoxli, antotsian, oq tola;

10. SS Rprp Fr^br Fr^br - 2 cheklanmagan shoxli, oraliq rang, oq tola;

11. Ss RpRp Fr^br Fr^br- 2 cheklanmagan shoxli, antotsian, oq tola;

12. Ss Rprp Fr^br Fr^br - 4 cheklanmagan shoxli, oraliq rang, oq tola;

13. SS rprp Fr^Br Fr^Br - 1 cheklanmagan shoxli, yashil, qo‘ng‘ir tola;

14. SS rprp Fr^Br Fr^br - 2 cheklanmagan shoxli, yashil, novvot rang tola;

15. Ss rprp Fr^Br Fr^Br - 2 cheklanmagan shoxli, yashil, qo‘ng‘ir tola;

16. Ss rprp Fr^Br Fr^br - 4 cheklanmagan shoxli, yashil, novvot rang tola;

17. ss RpRp Fr^Br Fr^Br- 1 cheklangan shoxli, antotsian, qo‘ng‘ir tola;

18. ss Rprp Fr^Br Fr^Br - 2 cheklangan shoxli, oraliq rang, qo‘ng‘ir tola;

19. ss RpRp Fr^Br Fr^br- 2 cheklangan shoxli, antotsian, novvot rang tola;

20. ss Rprp Fr^Br Fr^br - 4 cheklangan shoxli, oraliq rang, novvot rang tola;

21. SS rprp Fr^br Fr^br - 1 cheklanmagan shoxli, yashil, oq tola;

22. Ss rprp Fr^br Fr^br - 2 cheklanmagan shoxli, yashil, oq tola;

23. ss RpRp Fr^br Fr^br - 1 cheklangan shoxli, antotsian, oq tola;

24. ss Rprp Fr^br Fr^br - 2 cheklangan shoxli, oraliq rang, oq tola;

25. ss rprp Fr^Br Fr^Br - 1 cheklangan shoxli, yashil, qo‘ng‘ir tola;

26. ss rprp Fr^Br Fr^br - 2 cheklangan shoxli, yashil, novvot rang tola;

27. ss rprp Fr^br Fr^br - 1 cheklangan shoxli, yashil, oq tola;

F₂ da hosil bo‘ladigan fenotipik sinflar

1. CHeklanmagan shoxlanishli, antotsian rangli, qo‘ng‘ir tola - 3

2. CHeklanmagan shoxlanishli, antotsian rangli, novvot rang tola- 6

3. CHeklanmagan shoxlanishli, antotsian rangli, oq tola - 3

4. CHeklanmagan shoxlanishli, oraliq rangli, qo‘ng‘ir tola - 6

5. CHeklanmagan shoxlanishli, oraliq rangli, novvot rang tola - 12

6. CHeklanmagan shoxlanishli, oraliq rangli, oq tola -6

7. CHeklanmagan shoxlanishli, yashil rangli, qo‘ng‘ir tola - 3

8. CHeklanmagan shoxlanishli, yashil rangli, novvot rang tola - 6

9. CHeklanmagan shoxlanishli, yashil rangli, oq tola - 3

10. CHeklangan shoxlanishli, antotsian rangli, qo‘ng‘ir tola - 1

11. CHeklangan shoxlanishli, antotsian rangli, novvot rang tola - 2

12. CHeklangan shoxlanishli, antotsian rangli, oq tola - 1

13. CHeklangan shoxlanishli, oraliq rangli, qo‘ng‘ir tola - 2

14. CHeklangan shoxlanishli, oraliq rangli, novvot rang tola - 4

15. CHeklangan shoxlanishli, oraliq rangli, oq tola - 2

16. CHeklangan shoxlanishli, yashil rangli, qo‘ng‘ir tola - 1

17. CHeklangan shoxlanishli, yashil rangli, novvot rang tola - 2

18. CHeklangan shoxlanishli, yashil rangli, oq tola - 1

Bitta belgi bo‘yicha to‘liq, ikkita belgi bo‘yicha to‘liqsiz dominantlik hodisasi kuzatiladigan bo‘lsa, F₂ da 18 ta fenotipik sinflar hosil bo‘ladi. Ularning nisbati 3:6:3:6:12:6:3:6:3:1:2:1:2:4:2:1:2:1.

Genotipik sinflar soni - 27 ta.