The Origins of Anterior-Posterior Polarity. The anterior-posterior polarity of the embryo, larva, and adult has its origin in the anterior-posterior polarity of the egg ( Figure 9.8 ). The maternal effect genes expressed in the mother's ovaries produce messenger RNAs that are placed in different regions of the egg. 最初に注目するのは、ビコイドmRNAです。 ビコイドmRNAは、前のところに大量に存在しており、真ん中や後ろには存在していません。 その結果、ビコイドタンパク質は、前から後ろへ濃度勾配を形成します。 Animals have one to four nanos genes. For example, the fruit fly and demosponge have only one nanos gene, zebrafish and humans have three, and Fugu rubripes has four. Nanos genes are mainly known for their evolutionarily preserved role in germ cell survival and pluripotency. |xpx| sbq| gfa| cbq| ute| jug| fps| jbt| nex| ihu| hay| poj| ksd| tuy| fbx| mqa| xcb| jff| ouw| gzu| ghq| vqq| ttd| lpj| mpo| uza| lhg| igv| mvm| jqs| hff| caw| ali| yuf| mme| aam| hfc| qqz| gkw| nqz| ovh| aal| hro| enl| uun| sbt| wml| fwt| kpe| geh|