复习：基因的普适性源于稳定性、可塑性、积累性和有效性 基因调节区的突变可以造成胚胎发育的巨大区别 ORGANISM A RELATED ORGANISM B embryonic stage 1 embryonic stage 1 gene 1 gene 2 gene 3 gene 1 gene 2 gene 3 regulatory DNA sequences transcription TIME TIME regulator transcription embryonic stage 2 regulator embryonic stage 2 gene 1 gene 2 gene 3 gene 1 gene 2 gene 3 (A) (B) 食蚁兽 家犬复习：基因的普适性源于稳定性、可塑性、积累性和有效性 食蚁兽 家犬 基因调节区的突变可以造成胚胎发育的巨大区别