Detail Emergence of Novel Color   Oleh:  Jacobs, Gerald H. ; Williams, Gary A. ; Cahill, Hugh ; Nathans, Jeremy Jenis: Article from Bulletin/Magazine Dalam koleksi: SCIENCE (keterangan: ada di Proquest) vol. 315 no. 5819 (Mar. 2007), page 1723. Ketersediaan Perpustakaan FK Nomor Panggil: S01.K.2007.03 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada     Lihat Detail Induk Isi artikel Changes in the genes encoding sensory receptor proteins are an essential step in the evolution of new sensory capacities. In primates, trichromatic color vision evolved after changes in X chromosome-linked photopigment genes. To model this process, we studied knock-in mice that expressed a human long-wavelength-sensitive (L) cone photopigment in the form of an X-linked polymorphism. Behavioral tests demonstrated that heterozygous females, whose retinas contained both native mouse pigments and human L pigment, showed enhanced long-wavelength sensitivity and acquired a new capacity for chromatic discrimination. An inherent plasticity in the mammalian visual system thus permits the emergence of a new dimension of sensory experience based solely on gene-driven changes in receptor organization. Opini Anda Klik untuk menuliskan opini Anda tentang koleksi ini! Kembali

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