Saved Bookmarks
| 1. |
Question : What is incomplete dominance? Explain with examples. |
|
Answer» Solution :"When the alleles are in heterozygous condition, the DOMINANT gene fails to suppress the recessive gene completely and produce a new trait which is different from their parents". The PHENOTYPE of `F_1` generation does not resemble either of the TWO parents and the expression is in between the two. Inheritance of flower colour in the dog flower or snapdragon (Antirrhinum sps.) is a good example for incomplete dominance. In a cross between TRUE breeding RED flowered (RR) plant and true breeding white flowered (rr) plants, the `F_1` hybrids produce pink coloured flowers (Rr). When the `F_1` hybrids are self pollinated (self cross), the `F_2` generation resulted in the ratio of 1:2:1[1Red (RR) : 2 Pink (Rr): 1White (rr)]. Here, the phenotype ratio does not resemble the Mendelian monohybrid cross but the genotype ratio is exactly similar to that of Mendelian monohybrid cross. 
|
|