Why do nematodes need two thousand genes 20

Humans have about 25,000 genes, Drosophila has only 14,000, and nematodes (Caenorhabditis elegans, which have completed genetic sequencing) have nearly 20,000 (not 2,000). The number of genes is not strictly proportional to the complexity of biological heights.

However, as the complexity of the organism increases, the degree of duplication in the genome increases, which can be reflected in the number of DNA domains. There are two types of genes: structural genes (basic and essential genes that encode proteins) and regulatory genes (genes that encode proteins that suppress or activate transcription of structural genes), the latter of which can be very numerous and have far more complex functional mechanisms. For higher organisms, a structural gene is regulated by different regulatory genes, and different segments can transcribe and express different products, which greatly improves the efficiency of gene use and thus reflects its higher evolutionary status.

Due to the lack of such a flexible and efficient mechanism, the proportion of structural genes in lower organisms is much larger than that of higher organisms, and even the absolute number is larger, which is fundamentally determined by the conservatism of biological evolution. And precisely because there are few regulatory genes, there are many fewer schemes to regulate expression, which also determines its inferior status.

Don't you have a "protein" link on the right side of your NCBI page? Click directly on it and there will be a protein sequence trace. You can also find ** translation tools, a lot of them. Du Niang didn't let the link be posted without checking the way.

Function**You can take a look at the literature report of this gene homologous gene. You can take a look at the documents listed in the journal.

Through gene sequencing and comparison with the RDNA sequences in GenBank, the results showed that the sequences of the four populations of GFCH, Hanh, GZLL and GZLBS had high homology with the Rudophulus Similis Throne sequence in GenBank.

There should be. However, there may be less solution left and the concentration will be higher. Since the PCR cycle reaches a certain number of times, that is, it enters the plateau stage, no matter how many amplification times there are, the growth of the product is also very slow.

Rhizosphere nematodes refer to nematodes that parasitize the soil around plant roots, and there are many species of rhizosphere nematodes, and root-knot nematodes are one of them.

You, are you away from your home customer refuse.

First find your gene in the NCBI gene database, then determine which chromosome it is, and its position on the chromosome, then enter the Genome database, find the chromosome where your gene is located, enter the location of your desired DNA sequence in the Change Region Show (e.g. 19999-21000), and click to confirm.

I don't quite understand what you're talking about.