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"Back mutation" nghĩa là gì?
28 May, 2023
"Back mutation" = đột biến ngược -> nghĩa là quá trình đột biến trở lại trạng thái ban đầu.
Ví dụ
Since the beginning of the century has it been known that unstable (không ổn định) or variable gene loci occur in plants although the drastically enhanced (tăng cường) mutability and the increased back mutation rate could not be explained at first. The decisive breakthrough was accomplished by B. McCLINTOCK with her studies on maize chromosomes published in 1947 and 1951. The basis of these were her earlier observations and analyses (phân tích) (1938) on breakage-fusion (reunion)-bridges. Their occurrence could be correlated (tương quan) with the restructuring in chromosomes.
This happens in several cells during the development of the maize (ngô) grain. These cells are the origin of the aleuron layer and the pericarp and the back mutation can only be perceived in the clones (nhân bản) that form out of the changed cells.
However, some mutations can correct the effects of primary mutations. Back mutation and suppressor mutation are two such types of mutation. They involve in reversing the effects of the primary mutation.
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Bài trước: "Backing store" nghĩa là gì?
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