所谓「化石基因」或「古老基因」指什么，研究它们如何帮助理解早期生命？
What are so-called fossil genes or ancient genes, and how does studying them help understand early life?
古老基因指可追溯至最后共同祖先、在现今众多谱系中仍保留的核心基因，而化石基因是已失活但残留在基因组中的遗迹。通过系统发育与比较基因组重建这些序列，可推断早期细胞的代谢与遗传机器雏形。
Ancient genes are core genes traceable to the last common ancestor and retained across many lineages, while fossil genes are inactivated relics retained in genomes. Reconstructing these sequences via phylogenetics and comparative genomics infers the metabolism and genetic machinery of early cells.
难度 专业 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Lewin's Genes XII,Jones & Bartlett Learning,2018
Lewin's Genes XII, Jones & Bartlett Learning, 2018
#古老基因 #化石基因 #比较基因组 #最后共同祖先
同源异型突变（homeosis）如何证明单个基因可决定整段身体的身份？
How do homeotic mutations demonstrate that a single gene can determine the identity of an entire body segment?
同源异型突变使身体某一体节长出本属于另一体节的结构（如果蝇长出额外翅膀或腿代替触角），说明 Hox 基因以「位置指令」方式指定体节命运。这种整段替换揭示发育蓝图是模块化的，并可用少量主控基因重排。
Homeotic mutations cause one body segment to develop structures belonging to another, such as a fly growing an extra wing or legs in place of antennae, showing Hox genes act as positional commands specifying segment fate. Such whole-segment substitutions reveal a modular body plan rewirable by a few master regulators.
难度 专业 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-10-04
来源 · Source
Gilbert《Developmental Biology》,Sinauer Associates,2010
Gilbert S.F., Developmental Biology, Sinauer Associates, 2010
独立核验依据 · Independent verification: 核验依据 1 ISBN 9781605358246 (2013)
#同源异型突变 #体节命运 #位置指令 #主控基因
什么是「基因共选」（gene co-option），它在新性状起源中扮演什么角色？
What is gene co-option, and what role does it play in the origin of novel traits?
基因共选指已存在的基因被「招募」到新的发育或生理功能中，而非从头产生新基因。例如羽毛最初可能用于保温或展示，后被共选用于飞行，体现旧零件的新功能化是创新的常见来源。
Gene co-option is the recruitment of an existing gene into a new developmental or physiological role rather than de novo gene birth. Feathers, for instance, may have first served insulation or display and were later co-opted for flight, showing how old parts gain new functions as a common source of innovation.
难度 进阶 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-10-04
来源 · Source
Gilbert《Developmental Biology》,Sinauer Associates,2010
Gilbert S.F., Developmental Biology, Sinauer Associates, 2010
独立核验依据 · Independent verification: 核验依据 1 ISBN 9781605358246 (2013)
#基因共选 #新性状 #功能化 #演化创新
眼睛等复杂器官在不同谱系中多次独立演化，这给演化发育研究带来什么启示？
Complex organs like the eye evolved independently multiple times across lineages; what does this imply for evo-devo research?
眼睛在软体动物、节肢动物与脊椎动物中独立起源，却共享 Pax6 等主控基因，提示深层保守的发育模块可被不同路径「调用」产生相似构造。这说明趋同演化常重用了古老的基因调控核心。
Eyes originated independently in mollusks, arthropods and vertebrates yet share master regulators such as Pax6, suggesting deeply conserved developmental modules can be recruited by different paths to build similar structures. Convergent evolution thus often reuses ancient gene-regulatory cores.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-10-04
来源 · Source
Gilbert《Developmental Biology》,Sinauer Associates,2010
Gilbert S.F., Developmental Biology, Sinauer Associates, 2010
独立核验依据 · Independent verification: 核验依据 1 ISBN 9781605358246 (2013)
#眼睛演化 #趋同演化 #Pax6 #主控基因
刺鼠基因（agouti）的演化如何解释哺乳动物毛色与环境适应的关系？
How does the evolution of the agouti gene explain the relationship between mammalian coat color and environmental adaptation?
agouti 调控黑色素细胞产生真黑与褐黑素的比例，其表达时空调控的改变使动物毛色随季节或栖息地变化以利伪装。例如某些鼠类与雪兔的季节性换色就与 agouti 相关调控变异有关。
Agouti regulates the ratio of eumelanin to pheomelanin produced by melanocytes, and changes in its spatiotemporal control let coat color shift with season or habitat for camouflage. Seasonal color change in some rodents and snowshoe hares is linked to regulatory variation around agouti.
难度 进阶 · 适合 大众
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：此条未指向带版次的可引用著作（通识性内容、机构文件或未展开的英文书名），本库不提供独立书目出处；如需精确引用，需由编辑补全具体篇目与版次。
Nature (2013) 494:87-90，季节性毛色研究（agouti）
Nature (2013) 494:87-90, study on seasonal coat color (agouti)
#agouti #毛色 #适应性 #调控变异
演化发育生物学的核心观点「变异多来自调控而非蛋白编码」是什么意思？
What does the evo-devo core idea that much variation comes from regulation rather than protein coding mean?
evo-devo 强调形态差异常源于基因表达在何时、何处、多强的改变，而非编码蛋白序列的大改。相同的工具基因集通过不同的调控网络被重新接线，就能产生多样的形态，例如同源基因在不同动物中的表达边界变化。
Evo-devo emphasizes that morphological differences often arise from changes in when, where and how strongly genes are expressed, rather than major alterations to protein sequences. The same toolkit genes are rewired through different regulatory networks to yield diverse forms, as seen in shifted expression boundaries of homologous genes across animals.
难度 进阶 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-10-04
来源 · Source
Gilbert《Developmental Biology》,Sinauer Associates,2010
Gilbert S.F., Developmental Biology, Sinauer Associates, 2010
独立核验依据 · Independent verification: 核验依据 1 ISBN 9781605358246 (2013)
#evo-devo #调控演化 #基因网络 #工具基因
同源异型盒（Hox）基因家族在动物体轴发育与演化中为何如此保守？
Why is the Hox gene family so conserved in animal body-axis development and evolution?
Hox 基因沿前后轴呈空间共线排列，以位置特异性方式调控下游大量靶基因，决定体节身份。其在从昆虫到脊椎动物的发育蓝图中高度保守，说明早期确立的调控模块被反复沿用，微小改动即可产生显著的形态演化。
Hox genes are arranged colinear with the anterior-posterior axis and specify segment identity by spatially regulating many downstream targets. Their high conservation from insects to vertebrates shows an early-established regulatory module reused repeatedly, where small changes yield major morphological evolution.
难度 进阶 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-10-04
来源 · Source
Gilbert《Developmental Biology》,Sinauer Associates,2010
Gilbert S.F., Developmental Biology, Sinauer Associates, 2010
独立核验依据 · Independent verification: 核验依据 1 ISBN 9781605358246 (2013)
#Hox 基因 #体轴 #共线原则 #形态演化