GATE XL Genetics and genomics PYQs & Answers

Questions 1–10 of 33. Imported answers require independent review unless marked reviewed.

Correctly match the following molecules/methods in Group-I with their major uses in Group-II.

Group-I: (P) CRISPR-Cas9 (Q) DNA Microarray (R) Vir genes (S) RAPD

Group-II: (1) Global gene expression analysis (2) Molecular marker (3) Targeted gene editing (4) Agrobacterium-mediated plant transformation

Your answerChoose one option.

P–1; Q–3; R–2; S–4

P–3; Q–1; R–4; S–2

P–3; Q–1; R–2; S–4

P–1; Q–3; R–4; S–2

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Two completely linked genes A and B regulate plant height and flower colour, respectively, where the recessive mutant aa is dwarf bearing red flowers and the recessive mutant bb is tall bearing white flowers. If an F1 individual of the aaBB × AAbb cross is crossed to the mutant aabb, then the probability of an individual in the next generation bearing white flower would be __________ (Round off to two decimal places).

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If an egg cell of a diploid plant species has 10 chromosomes, the expected number of chromosomes in a double trisomic somatic cell of this species would be ____________ (Answer in integer).

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The following table summarizes the flowering time (days to flower) and the transcript levels in four genotypes of a plant species.

Genotype | Days to flower | Transcript level of gene A | Transcript level of gene B Wild type | 30 | Normal | Normal a mutant | 15 | Nil | Increased b mutant | 60 | Normal | Nil ab double mutant | 60 | Nil | Nil

Which one of the following genetic pathways best explains the observations shown in the table?

Your answerChoose one option.

A gene activates B, which suppresses flowering transition

A gene suppresses B, which promotes flowering transition

B gene activates A, which suppresses flowering transition

B gene suppresses A, which promotes flowering transition

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In a genetic cross between a true-breeding tall parent bearing red flowers and a true-breeding dwarf parent bearing white flowers, only tall plants with red flowers are obtained in the F₁ population. Considering these two traits segregate independently, if one tall individual is selected from the F₂ population, the probability that it would be genotypically homozygous for plant height and make red flowers is __________ (Round off to two decimal places).

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In a genetic cross between two pure-line parents differing in the two independent segregating traits, plant height (tall vs dwarf) and flower color (purple vs white), all the F1 plants were tall with purple flowers. In a testcross population involving these F1 individuals, the expected percentage (%) of dwarf plants with purple flower would be ______ (in integer).

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The mRNA of a hypothetical plant gene HSDU is 800-nucleotide long and encodes a protein of 160 amino acid residues. The calculated length of HSDU CDS would be ______ nucleotides (in integer).

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DNA in a 1 cm long chromatin contains 5 × 10⁹ base pairs. The fold compaction of this DNA within the chromatin is ______ (in integer).

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Match the tasks given in Group I with the associated techniques conventionally used as listed in Group II.

Group I P. Ploidy analysis Q. Profiling DNA methetion R. Identifying non-coding RNAs S. Identifying SNPs T. Satellite DNA isolation

Group II

RNA sequencing

Exome sequencing

Fluorescence in situ hybridization

Bisulfite sequencing

Density-gradient centrifugation

Your answerChoose one option.

P-2; Q-1; R-3; S-4; T-5

P-3; Q-4; R-1; S-2; T-5

P-5; Q-4; R-1; S-2; T-3

P-3; Q-5; R-1; S-2; T-4

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In a diploid angiosperm species, flower colour is regulated by the R gene. RR and Rr genotypes produce red flowers, whereas the rr genotype produces white flowers. If two individual plants are randomly selected from a large segregating population of a genetic cross between RR and rr parents, the probability of both the plants producing red flowers is ______. (Rounded off to two decimal places)

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GATE XL Genetics and genomics PYQs

How to practice Genetics and genomics

Question 49

Question 64

Question 54

Question 58

Question 65

Question 64

Question 65

Question 35

Question 55

Question 63