In the late nineteenth century, evolutionary biologists enthusiastically adopted Ernst Haeckel’s biogenetic law, which asserted that an embryo’s developmental stages recapitulate the adult evolutionary forms of its ancestors. However, this recapitulationist consensus glossed over the earlier, more nuanced embryological principles formulated by Karl Ernst von Baer in 1828. Von Baer argued that development proceeds from general, clade-wide characteristics to increasingly specialized species traits, explicitly denying that higher animals pass through the adult states of lower organisms. Recent historiography has reexamined this intellectual divergence, highlighting how Haeckel’s compelling linear narrative temporarily eclipsed von Baer’s branching framework. Far from being a mere precursor to Haeckel, von Baer offered a non-teleological model of differentiation that anticipated modern evolutionary developmental biology far more accurately than Haeckel’s rigid recapitulationism. Historians now argue that the long-standing emphasis on Haeckel obscured von Baer’s crucial insight: embryonic development reflects ancestral embryonic patterns, not adult evolutionary stages.
Which of the following best states the primary purpose of the passage?
- Reevaluate the historical significance of von Baer’s embryological framework relative to Haeckel’s recapitulation theory.Cevap
- BDetail the specific cellular mechanisms by which embryonic traits differentiate into species-specific features.
- CArgue that Haeckel intentionally falsified embryological data to gain widespread acceptance for his biogenetic law.
- DTrace the historical development of modern evolutionary developmental biology from antiquity to the contemporary era.
- ECondemn nineteenth-century biologists for systematically suppressing non-teleological theories of animal development.