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What should be the maternal to paternal endosperm balance number (EBN) ratio in hybrid endsosperm for normal
endosperm development in potato?
EXPLANATION
Distant Hybridization, Endosperm Balance Numb
- Endosperm Balance Number (EBN) in Potato:
- Developed by Johnston and Hanneman (1980) to explain crossability barriers among Solanum species.
- Normal endosperm development in angiosperms requires an exact maternal-to-paternal Endosperm Balance Number ratio of $2 : 1$ in the hybrid endosperm:
- The central cell contributes two maternal genomes while the pollen tube delivers one paternal sperm nucleus ($2\text{m} : 1\text{p}$). Any deviation from $2 : 1$ causes endosperm breakdown and embryo lethality.
- Correct Option: Option 4 (2:1).
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