Whether or not the story is true, the symbolism of the thistle (ahem, sorry for the pun) took root and is honored to this day. Other facts about the thistle include that it is a biennial plant, meaning it takes two years to complete its life cycle. It reseeds easily. It's a combination of beauty and ruggedness. It has a spreading, invasive root system, hence its classification as weed.
imprinted gene, a gene whose expression has been affected by genomic imprinting so that only a single allele functions, the other being turned off by epigenetic mechanisms during embryonic development.
Sometimes the copy from mother or father is silenced, and only the copy from one parent is active. If the only active gene is damaged, it can show up in the form of genetic disease. An example of genomic imprinting, is the mixing of tigers and lions.Who the mother is, has direct effect on the offspring. A mother tiger and a father lion, results in a liger. Ligers are much bigger than either parent. A mother lion and a father tiger, results in a tigon.ometimes the copy from mother or father is silenced, and only the copy from one parent is active. If the only active gene is damaged, it can show up in the form of genetic disease. An example of genomic imprinting, is the mixing of tigers and lions.