Genetikadan masala ishlash

Poliduragay chatishtirish.

92-masala*. Quyida keltirilgan genotiplar qanday tipdagi gametalarni hosil qiladi?

1) CCDDKK; 2) CCDdkk; 3) CcDdKK; 4) CcDdKk; 5) CcDdKkLl

Masalaning echilishi:

1) CCDDKK = CDK (gomozigotali bo‘lgani uchun faqat bir tipdagi gametalarni hosil qiladi).

2) CCDdkk = CDk, Cdk (monogeterozigotali bo‘lgani uchun ikki tipdagi gametalarni hosil qiladi).

3) CcDdKK = CDK, CdK, cDK, cdK ( digeterozigotali bo‘lgani uchun to‘rt tipdagi gametalarni hosil qiladi).

4) CcDdKk = CDK, CDk, CdK, cDK, Cdk, cDk, cdK, cdk ( trigeterozigotali bo‘lgani uchun sakkiz tipdagi gametalarni hosil qiladi).

5) CcDdKkLl = tetrageterozigotali bo‘lgani uchun o‘n olti tipdagi gametalarni hosil qiladi. Gameta hosil bo‘lishining uch xil yo‘lini ko‘rib o‘tamiz:

a) CcDdKkLl = CDKL, CDKl, CDkL, CdKL, cDKL, CDkl, CdKl, CdkL, cDKl, cDkL, cdKL, Cdkl, cDkl, cdKl, cdkL, cdkl.

b) CDKL CdKL cDKL cdKL

CDKl CdKl cDKl cdKl

CDkL CdkL cDkL cdkL

CDkl Cdkl cDkl cdkl

v ) C c

D d D d

K k K k K k K k

L l L l L l L l L l L l L l L l