Quantitative & Biometrical Genetics Practice Questions (Q21-25) - Genetics & Plant Breeding

21

ICAR JRF Genetics And Plant Breeding 29 Jun 2024Shift 1

MCQ (Single Correct) +4 −1

Gynoecious cucumber lines are maintained by using

Silver nitrate Ethrel 1AA ABA

22

ICAR JRF Genetics And Plant Breeding 29 Jun 2024Shift 1

MCQ (Single Correct) +4 −1

Which is correct about the 4E-ms System of Producing Hybrid Wheat

(A) . The 4E chromosome carries Blue aleurone (Ba) gene with dosage effect

(B) . The 4E chromosome also carries male fertile (Ms) gene

(C) . The white seeds will give male sterile plant and used in hybrid seed production

(D) . Deep blue seed with 2n+2 chromosome will be used as maintainer line

Choose the correct answer from the options given below:

(A), (6) and (D) only. (A), (B) and (C) only, (A), (B), (C) and (D). (B), (C) and (D) only.

23

ICAR JRF Genetics And Plant Breeding 29 Jun 2024Shift 1

MCQ (Single Correct) +4 −1

To know the allelic relation between restorer gene(S) for two restore lines, the lines were crossed to generate F;. The F; plant was crossed as pollen parent with CMS line. Proper care was taken to avoid any chance of cross contamination by foreign pollen. The 1000 progenies obtained from the seed on CMS line have mostly fertile plants except 5 sterile plants. The result indicates that

Both the lines are carrying different restorer gene and are independently assorting Both the lines are carrying different restorer genes closely linked in repulsion phase Both the lines are carrying same restorer gene but are recessive in nature Both the lines are carrying different restorer genes closely linked in coupling phase

24

ICAR JRF Genetics And Plant Breeding 29 Jun 2024Shift 1

MCQ (Single Correct) +4 −1

The species concept that explains that a species’ integrity is maintained by interbreeding within a species as well as by reproductive barriers between organisms in different species is known as

Phylogenetic species concept Ecological species concept Biological species concept Modern species concept

25

ICAR JRF Genetics And Plant Breeding 29 Jun 2024Shift 1

MCQ (Single Correct) +4 −1

Van Valen's (1976) Ecological species concept explains that a species taxon as a lineage of organisms is maintained and segmented by ecological forces. Accordingly, the species integrity is maintained by:

Stabilizing selection while disruptive selection can lead to new species Reproductive barriers between organisms Exchange genetic information through interbreeding Pre-zygotic barriers upon hybridization

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