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6. The following pedigree represents the inheritance of a rare disorder. Based on the above pedigree. what is the most likely mode of inheritance? (1) Autosomal dominant (2) X-linked recessive (3) X-linked dominant (4) Y-linked dominant

CSIR NET Life Science Previous Year Questions and Solution on Genetics

Identifying X‑Linked Dominant Inheritance in a Rare Disorder

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December 5, 2025
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6. The following pedigree represents the inheritance of a rare disorder. Based on the above pedigree. what is the most likely mode of inheritance? (1) Autosomal dominant (2) X-linked recessive […]

5. Given below is a pedigree a pattern of inheritance: The following statements are drawn from the above pedigree towards understanding the pattern of inheritance. A. An affected male does not appear to pass the trait to his sons B. An affected male appear to pass the allele to a daughter who is unaffected C. All affected individuals have at least one affected parent D. The given trait appear to be a recessive one E. The given trait appears to be an autosomal recessive one Select the option from the following that has all correct statements: (1) C and E only (2) A, B and D only (3) E only (4) A, B, C, D and E

CSIR NET Life Science Previous Year Questions and Solution on Genetics

Identifying X‑Linked Recessive Inheritance

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December 5, 2025
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5. Given below is a pedigree a pattern of inheritance: The following statements are drawn from the above pedigree towards understanding the pattern of inheritance. A. An affected male does […]

4. Given below is a pedigree indicating a pattern of inheritance: Which one of the following options correctly describes the pattern of inheritance shown in the above pedigree? (1) X-linked recessive (2) Autosomal recessive (3) X-linked dominant (4) Autosomal dominant

CSIR NET Life Science Previous Year Questions and Solution on Genetics

Identifying X‑Linked Dominant Inheritance

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December 5, 2025
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4. Given below is a pedigree indicating a pattern of inheritance: Which one of the following options correctly describes the pattern of inheritance shown in the above pedigree? (1) X-linked […]

3. The following pedigree represents the inheritance of a rare disorder. Based on the above pedigree, what is the most likely mode of inheritance? (1) Autosomal Dominant (2) X-linked recessive (3) X-linked dominant (4) Autosomal recessive

CSIR NET Life Science Previous Year Questions and Solution on Genetics

Pedigree Analysis of a Rare Disorder

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December 5, 2025
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3. The following pedigree represents the inheritance of a rare disorder. Based on the above pedigree, what is the most likely mode of inheritance? (1) Autosomal Dominant (2) X-linked recessive […]

2. Consider the following pedigree chart (1) X-linked recessive (2) X-linked dominant (3) Sex limited recessive (4) Autosomal dominant

CSIR NET Life Science Previous Year Questions and Solution on Genetics

Identifying X‑Linked Recessive Inheritance

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December 5, 2025
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2. Consider the following pedigree chart (1) X-linked recessive (2) X-linked dominant (3) Sex limited recessive (4) Autosomal dominant The pedigree chart is most consistent with an X‑linked recessive mode of inheritance, […]

1. The following pedigree tree represents (1) Autosomal Dominant (2) Autosomal Recessive (3) X-linked Dominant (4) X-linked Recessive

CSIR NET Life Science Previous Year Questions and Solution on Genetics

Identifying Autosomal Recessive Inheritance

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December 5, 2025
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1. The following pedigree tree represents (1) Autosomal Dominant (2) Autosomal Recessive (3) X-linked Dominant (4) X-linked Recessive Introduction Pedigree analysis questions are common in CSIR NET and other life‑science […]

39. An E. coli strain has metB1 (90 min) and leuA5 (2 min) mutations. It also has strA7 (73 min) mutation and Tn5 transposon which confers streptomycin and kanamycin resistance, respectively, inserted in its chromosome. The mutant strain was crossed with an Hfr strain that is streptomycin sensitive and has a hisG2 mutation (44 min) that makes it require histidine. After incubation for 100 min, the cells were plated on minimal plate supplemented with leucine, histidine and streptomycin to select the metB marker. After purifying 100 of the Met+ transconjugants, one finds that 15 are His+, 2 are Leu+ and 12 are kanamycin sensitive. The unselected markers are A. metB1 and leuA5 mutation. B. leuA5 and Tn5 insertion mutation. Which of the above statement is correct and what is the position of transposon insertion? (1) A and before 73 min (2) B and before 44 min (3) B and before 73 min (4) A and before 44 min

CSIR NET Life Science Previous Year Questions and Solution on Genetics

Hfr Conjugation Unselected Markers

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December 5, 2025
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An E. coli strain has metB1 (90 min) and leuA5 (2 min) mutations. It also has strA7 (73 min) mutation and Tn5 transposon which confers streptomycin and kanamycin resistance, respectively, […]

38. A conjugation experiment is carried out between F+ his+ leu+ thr+ pro+ bacteria and F- his- leu- thr- pro- bacteria for a period of 25 minutes. At this time the mating is stopped, and the genotypes of the recipient F- bacteria are determined. The results are shown below: Genotype Number of colonies his+ 0 leu+ 13 thr+ 26 pro+ 6 What is the probable order of these genes on the bacterial chromosome? (1) thr, leu, pro, his (2) pro,leu, thr and the position of his cannot be determined. (3) thr, leu, pro, and the position of his cannot be determined (4) his, pro, leu, thr 38. A conjugation experiment is carried out between F+ his+ leu+ thr+ pro+ bacteria and F- his- leu- thr- pro- bacteria for a period of 25 minutes. At this time the mating is stopped, and the genotypes of the recipient F- bacteria are determined. The results are shown below: Genotype Number of colonies his+ 0 leu+ 13 thr+ 26 pro+ 6 What is the probable order of these genes on the bacterial chromosome? (1) thr, leu, pro, his (2) pro,leu, thr and the position of his cannot be determined. (3) thr, leu, pro, and the position of his cannot be determined (4) his, pro, leu, thr

CSIR NET Life Science Previous Year Questions and Solution on Genetics

Bacterial Conjugation Gene Order Mapping

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December 5, 2025
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38. A conjugation experiment is carried out between F+ his+ leu+ thr+ pro+ bacteria and F– his– leu– thr– pro– bacteria for a period of 25 minutes. At this time […]

37. Using interrupted mating, four Hfr strains were analysed for the sequence in which they transmitted a number of different genes to a F- strain. Each Hfr strain was found to transmit its genes in a unique order as summarized in the table (Only the first five genes were scored) Order of transmission Hfr strain 1 2 3 4 First A B M F B A K H D L J G F M G J Last H K H K Which one of the following correctly represents the gene sequence in the original strain from which the Hfr strain were derived as well as the place of integration and polarity of the F plasmid?

CSIR NET Life Science Previous Year Questions and Solution on Genetics

Interrupted Mating Hfr Mapping Problem

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December 4, 2025
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Using interrupted mating, four Hfr strains were analysed for the sequence in which they transmitted a number of different genes to a F- strain. Each Hfr strain was found to […]