Which of the following is correct for the condition when plant YyRr is back-crossed (test-crossed) with the double recessive parent?

NEET Biology question

Which of the following is correct for the condition when plant is back-crossed (test-crossed) with the double recessive parent?

(A)9:3:3:1 ratio of phenotypes only
(B)9:3:3:1 ratio of genotypes only
(C)1:1:1:1 ratio of phenotypes only
(D)1:1:1:1 ratio of phenotypes and genotypesCorrect

Answer: (D)

Solution

Test-crossing with the double recessive gives offspring , , , in equal (1:1:1:1) proportions. Because the tester parent contributes only recessive alleles, each

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Question ID VK-120309