Quantitative & Biometrical Genetics

• Johannsen's Pureline Theory (1903):
• Formulated by Danish botanist and geneticist Wilhelm Johannsen in 1903.
• Conducted selection experiments on seed weight in the self-pollinated common bean (Phaseolus vulgaris) cultivar 'Princess'.
• Demonstrated that a pure line is the progeny of a single self-fertilized homozygous individual, within which variation is entirely environmental and selection is ineffective. (Correct answer: Option 3)

• Centres of Origin of Agricultural Crop Species (Vavilovian Centres):
• China (Chinese Centre): Primary center of origin for Buckwheat (Fagopyrum esculentum) and Soybean $\rightarrow$ (IV)
• Hindustan (Indian Centre): Primary center of origin for Old World diploid cotton (Gossypium arboreum) and Pigeonpea $\rightarrow$ (I)
• South America (South American Centre): Center of origin for New World tetraploid cotton (Gossypium barbadense) and Potato $\rightarrow$ (V)
• Mediterranean Centre: Primary center of origin for Peppermint (Mentha piperita), durum wheat, and cabbage $\rightarrow$ (II)
• Asia Minor (Near Eastern Centre): Center of origin for Sweet chestnut, cultivated einkorn, and emmer wheat $\rightarrow$ (III)
• Systematic Match: (A)-(IV), (B)-(I), (C)-(V), (D)-(II), (E)-(III) corresponds to Option 3.

Correct option: (3) (A) - (IV), (B) - (1), (C) - (V), (DB) - (ID, (E) - (Ill)

• Nagaharu U's Triangle of Brassica Cytogenetics (1935):
• Brassica napus (Rapeseed): Amphidiploid ($2n = 4x = 38$, genome $AACC$), derived from B. rapa ($2n = 20$) $\times$ B. oleracea ($2n = 18$) $\rightarrow$ (III)
• Brassica juncea (Indian Mustard): Amphidiploid ($2n = 4x = 36$, genome $AABB$), derived from B. rapa ($2n = 20$) $\times$ B. nigra ($2n = 16$) $\rightarrow$ (I)
• Brassica carinata (Ethiopian Mustard): Amphidiploid ($2n = 4x = 34$, genome $BBCC$), derived from B. nigra ($2n = 16$) $\times$ B. oleracea ($2n = 18$) $\rightarrow$ (IV)
• Brassica nigra (Black Mustard): Primary diploid parent ($2n = 2x = 16$, genome $BB$) $\rightarrow$ (II)
• Systematic Match: (A)-(III), (B)-(I), (C)-(IV), (D)-(II) corresponds to Option 4.

Correct option: (4) (A) - (Ill), (B) - @), (C) - (IV), (B) - (Il)

• Indian Journal of Genetics and Plant Breeding (IJGPB):
• Official peer-reviewed journal of the Indian Society of Genetics and Plant Breeding (ISGPB), founded in 1941.
• The distinguished agricultural scientist and wheat breeder Dr. B.P. Pal served as its foundational architect and first Founder Editor. (Correct answer: Option 1)