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Question
Differentiate between:
monohybrid and dihybrid cross (phenotypic ratio)
Solution
| Monohybrid cross | Dihybrid cross | |
|
1. |
It involves a cross between two organisms differing in one trait. | It involves a cross between two organisms differing in two traits. |
| 2. | The progeny obtained from the monohybrid cross is called the monohybrid species. | The species obtained from the dihybrid cross is called dihybrid species. |
| 3. | It is used to study the inheritance of a single pair of alleles. | It is used to study the inheritance of two different alleles. |
| 4. | It is used to study the dominance of species. | It is used to study offspring assortment. |
| 5. | Example: Cross between Tt x TH (T = tall t = short) | Example: Cross between RrYy x RrYy (R = round, = wrinkled; Y = yellow, y = green) |
| 6. | The phenotypic ratio is : 3 : 1 | The genotypic ratio is 9 : 3 : 3 : 1 |
| 7. | The genotypic ratio is: 1 : 2 : 1 | The phenotypic ratio is 1 : 2 : 1 : 2 : 4 : 2 : 1 : 1 |
| 8. | The cross test ratio is 1 : 1 | The test cross ratio is 1 : 1 : 1 : 1 |
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