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In a certain plant , yellow fruit colour (Y) is dominant to green fruit colour (y) and round shape (R) is dominant to oval shape (r) . The two genes involved are located on different chromosomes.
Which of the following will result when plant YyRr is self - pollinated ?
Option: 1
9 : 3 : 3 : 1 ratio of phenotypes only
Option: 2
9 : 3 : 3 : 1 ratio of genotypes only
Option: 3
1 : 1 : 1 : 1 ratio of phenotypes only
Option: 4
1 : 1 : 1 : 1 ratio of phenotypes and genotypes
Answers (1)
As we learnt
Dihybrid cross -
It is a cross between plants differing in two traits.
- wherein
Like color and shape
When plant YyRr is self pollinated, 9 : 3 : 3 : 1 ratio of phenotypes is observed.
Phenotypic ratio = 9 yellow and round : 3 yellow and oval : 3 green and round : 1 green and oval.
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