GATE XL 2021 Paper 1 — page 21

Questions 61–63 of 125. Imported answers require review unless explicitly marked reviewed.

To understand the mechanism of systemic acquired resistance (SAR), a team of researchers isolated a mutant with reduced SAR response. Sequencing of this mutant revealed homozygous mutations in two genes, X and Y. Which of the following experiment(s) would test whether the mutant phenotype is caused by mutation in either or both the genes?

Your answerSelect all correct options. You can choose more than one.

Complement the mutant with X or Y and analyze the phenotype in each case.

Complement the mutant with both X and Y and analyze the phenotype.

Cross the mutant with wild-type and analyze the segregation pattern of the phenotype.

Compare the expression of X and Y in mutant and wild-type plants.

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

The observations of an experiment on seed germination in various genotypes under different light conditions are given, where √ and X indicate germination and the lack of it, respectively.

Genotype	Blue	Red	Far-red	White	Dark
Wild-type	√	√	√	√	X
cry1 mutant	X	√	√	√	X
phyA mutant	√	√	X	√	X
phyB mutant	√	X	√	√	X
vp1 mutant	√	√	√	√	√

Based on these observations, which of the following option(s) is/are CORRECT?

Your answerSelect all correct options. You can choose more than one.

All the three light qualities – blue, red and far-red – are required for seed germination.

Any one of the three light qualities – blue, red and far-red – is sufficient to induce seed germination.

The CRY1, phyA and phyB proteins are required for blue, red and far-red light perception, respectively.

The VP1 protein is unlikely to be involved in light perception.

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

Which of the following option(s) is/are CORRECT in the context of hybrid plant generation using Barnase/Barstar-based male sterile lines?

Your answerSelect all correct options. You can choose more than one.

Banase inhibits Barstar.

Barstar inhibits Banase.

Banase and Barstar are used to generate the male sterile line and the restorer line, respectively.

Banase and Barstar are used to generate the restorer line and the male sterile line, respectively.

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

2021 · Paper 1

Question 16

Question 17

Question 18