Acid, A Growth Hormone Is Responsible For The Growth Of Stems

1360 Words Dec 2nd, 2014 6 Pages
Gibberellic acid, a growth hormone, is responsible for the growth of stems in many plants; specifically, this paper highlights GA’s role in pea plants. Gregor Mendel, the earliest geneticist we know of, formed the theory of heredity, in which he described genes (traits) passed down from one generation to another. Using his knowledge, we tested whether an unknown genotype, le*, contained a mutation along the signaling pathway of GA. Based on our data, the le* pea plants treated with GA grew 20.2 cm. while the le* pea plants treated without GA only grew 5.9 cm. We can understand that the le* pea plants were able to synthesize the GA enzyme and grow taller as a result. Further, we performed gel electrophoresis to understand the genetic implications of GA testing. Based on the gel, the le and le* DNA fragments traveled 220 bp, while the Le DNA fragments traveled farther, at180 bp. This implies that a mutation was found in the Le portion of the le and le* genes.
Gregor Mendel, a 19th-century European monk, laid the groundwork for the concept of heredity, or the passing of genes from one generation to another. By studying observable traits in pea plants such as stem height and leaf color, Mendel understood that the inheritance of genes determined certain genotypes and thus, phenotypes. He also understood that sometimes, genes are passed down from parent to offspring, but are not necessarily expressed; this is the concept of dominant versus recessive genes (O’Neil 2013).
With this…
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