2022-2023-O’QUV YILI UCHUN ~ 63 ~
4-masala. Quyidagi populyasiyalarda A alleli (p) va a alleli (q) ning uchrash chastotalarini aniqlang:
a) AA = 36%, Aa = 48%, aa = 16%;
b) AA = 64%, Aa = 32%, aa = 4%;
v) AA = 49%, Aa = 42%, aa = 9%.
Yechilishi : Quyidagi populyasiyalarda A alleli (p) va a alleli (q) ning uchrash
chastotalarini aniqlang:
a) AA = 36%, Aa = 48%, aa = 16%;
b) AA = 64%, Aa = 32%, aa = 4%;
v) AA = 49%, Aa = 42%, aa = 9%.
Masalaning yechilishi:
a) mazkur populyasiyada AA genotipli (p
2
) individlarning uchrash chastotasini bilgan
holda, A allelining (p) uchrash chastotasini aniqlash mumkin:
AA = p
2
= 36% yoki 0,36 A = p = √p
2
= √0,36 = 0,6
a allelining (q) uchrash chastotasini 2 xil yo‗l bilan topish mumkin:
1) p + q = 1 formulasidan foydalanib a allelning uchrash chastotasini topish, ya‘ni q = 1
– p = 1 – 0,6 = 0,4;
2) aa = 16% 0,16 a = q = √q
2
= √0,16 = 0,4
Bu masalaning b va v punktlari ham xuddi shu tartibda echiladi.
4-masala. Populyatsiyada A dominant gen 60%,a retsessiv gen 40%.Geterozigota
orgsnizmlar chatishtirildi.1800 ta organizmdan nechtasi getero zigota?
A)648 B)864. C)1512. D)288
Xardi Vaynberg qonuni asosida yechiladi
Aa x Aa
AA,Aa,Aa,aa bo'ladi wundan
AA=60*60/100=36 ta gomozigota Katta A lar
2Aa=2*(60*40/100)=48 ta geterozigota organizmlar
aa=40*40/100=16 ta retsessiv organizmlar
agarda 100 tadan 48 tasi geterozigota bo'lsa 1800 tadan 864 tasi geterozigota organizmlar
bo'ladi
100-------48
1800-----x=864
JAVOB:B-864 5-masala. Ma‘lum populyatsiyada A genning uchrash chastotasi 60% ni a genni uchrach chastotasi
40% tashkil etsa, Ushbu papulyatsiyada jami 8000 ta organizmdan nechtasi geterazigotali
bo‘ladi.
