Directions : (6 - 10) |
Read the passage given below and answer the following questions. |
Though the genotypic ratios can be calculated using mathematical probability, but simply looking at the phenotype of a dominant trait, it is not possible to know the genotypic composition. That is, for example, whether a tall plant from \[{{F}_{1}}\] or \[{{F}_{2}}\] has TT or Tt composition, cannot be predicted. Therefore, to determine the genotype of a tall plant at \[{{F}_{2}}\], Mendel crossed the tall plant from \[{{F}_{1}}\], with a dwarf plant i.e., recessive parent. This he called a test cross. In a typical test cross an organism like Pea plants showing a dominant phenotype and whose genotype is to be determined is crossed with the recessive parent instead of self-crossing or selfing. The progenies of such a cross can easily be analysed to predict the genotype of the test organism. |
A) 1 : 2 : 1
B) 1 : 1
C) 3 : 1
D) 2 : 1
Correct Answer: B
Solution :
1 : 1You need to login to perform this action.
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