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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 is correct for the condition when plant YyRr is back crossed with the double recessive parent ?
9 : 3 : 3 : 1 ratio of phenotypes only
9 : 3 : 3 : 1 ratio of genotypes only
1 : 1 : 1 : 1 ratio of phenotypes only
1 : 1 : 1 : 1 ratio of phenotypes and genotypes
Answers (1)
As we learnt
Punnett square -
Punnett square is a graphical representation to calculate the probability of all possible genotypes of offspring in a genetic cross.
- wherein
When YyRr is crossed with double recessive parent then genotypic and phenotypic ratio is 1 : 1 : 1 : 1.
Phenotypic ratio = 1 yellow round : 1 yellow oval : 1 green round : 1 Green and oval . This reperesents a test cross .
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