The regulatory influence of the cell nucleus over plant morphology was first uncovered in___________________?
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Answer: B. Acetabularia
Explanation
Experiments using the giant single-celled alga Acetabularia proved the cell nucleus regulates plant morphology. Researchers could swap nuclei between different species and observe corresponding changes in cap shapes. This classic study demonstrated that genetic instructions stored inside the nucleus control physical form. Acetabularia is exceptionally well suited for experimental embryology because of its massive single-cell size. The alga consists of a foot containing the nucleus, a long stalk, and a characteristic cap. Joachim Hammerling conducted these landmark nucleocytoplasmic transfer experiments during the nineteen thirties.
This foundational experiment provided early physical proof that hereditary information resides within cell nuclei. Cell biologists cite this research when discussing how genetic master controls dictate organismal development. Understanding nuclear control mechanisms underpins modern genetic engineering and cell transplantation research. Pea plants were famously utilized by Gregor Mendel to discover the laws of inheritance. Macrospore refers to a spore type in plants rather than the experimental organism used in this study. Maize is a classic genetic model organism for studying transposons rather than early nucleocytoplasmic transfer.
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