Saved Bookmarks
| 1. |
Question : What is codominance ? Explainit with the help of a suitable example. |
|
Answer» Solution :1.Codominance : When both the genes of an ALLELOMORPHIC pair express themselves equally in `F_(1)`hybrid, the dominance is called codominance. 2. Explanation of codominance with a suitable example: (1) The inheritance of COAT colour in cattle is the classic example of codominance. (2)There are two types of coat colour in cattle, viz, RED (skin with red hair ) and white (skin with white hair ) (3) When a red cattle (RR) is crossed with a white cattle (WW) , the`F_(1)`hybridsposses roam colour (RW) . (4) Roans possess a mixture or red and white colour side by side.This shows that both red and white traite are expressed equally. (5) Further when roans are interbred, red, roans , and white are PRODUCED in 1:2:1ratio, which is evident from a cross given below :  Phenotypes = 1 Red, 2 Roans , 1 White Phenotypic ratio `= 1 :2 : 1 ` Genotypic ratio `= 1 :2 :1 ` |
|