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CSIR NET 2022 | Life Science: Inheritance Biology | 1 October

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Question 1

When is the phenotype ratio of 9:3:3:1 in the offspring of a mating of two organisms heterozygous for two traits is expected?

Question 2

Which of the following genotypes would not be expected to be found among the offspring of a GgYy x ggyy test cross?

Question 3

What is the frequency of genotype, AABb, that can occur in the offspring of dihybrid parents AaBb?

Question 4

Which of the following principle states that recessive characters, which are masked in the F1 from a cross between two true-breeding strains, reappear in a specific proportion in the F2 generation?

Question 5

Two strains of corn averaging 48 and 72 inches in height, respectively, are crossed. The FI progeny are quite uniform averaging 60 inches in height. Of 500 F2 plants, two are as short as 48 inches, and two are as tall as 72 inches. What is the probable number of polygenes involved in this trait?
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