EMBRYOLOGY-bio-1.Evidence of evolution.pptx

Evidences of evolution presenting embryology

1. EMBRYOLOGY As evidence of evolution

2. WHAT IS EMBRYOLOGY? 1

3. WHAT IS EMBRYOLOGY? Embryology , the study of the development of the anatomy of an organism to its adult form, provides evidence for evolution as embryo formation in widely-divergent groups of organisms tends to be conserved. Structures that are absent in the adults of some groups often appear in their embryonic forms, disappearing by the time the adult or juvenile form is reached. For example, all vertebrate embryos, including humans, exhibit gill slits and tails at some point in their early development. These disappear in the adults of terrestrial groups, but are maintained in adults of aquatic groups, such as fish and some amphibians. Great ape embryos, including humans, have a tail structure during their development that is lost by birth.

4. DEVELOPMENT OF EMBRYO Similarities in Early Development Homologous Structures Vestigial Structures Embryonic Recapitulation Comparative Embryology Evolutionary Conservation

5. SIMILARITIES IN EARLY DEVELOPMENT Embryos of different species share common features during early stages, indicating shared ancestry. For example, vertebrate embryos, including humans, show similar structures like pharyngeal pouches and tails, reflecting their evolutionary history.

6. HOMOLOGOUS STRUCTURES Structures in embryos that lead to different adult forms in various species can be homologous, showing evolutionary connections. For instance, vertebrates like humans, birds, and bats have forelimbs with a common developmental origin, despite their different functions.

7. VESTIGITAL STRUCTURES Some embryos display vestigial structures, remnants of ancestral features with lost functions. Examples include rudimentary gill slits in human embryos, reminiscent of our aquatic ancestors.

8. EMBRYONIC RECAPITULATION Embryonic development retains ancestral features that align with evolutionary relationships. This concept, proposed by Ernst Haeckel, suggests that the stages of embryo development mirror the species' evolutionary past.

9. COMPARATIVE EMBRYOLOGY Studying embryos from different species reveals similarities and differences in developmental processes. Comparisons help scientists infer evolutionary relationships and understand the evolutionary history of organisms.

10. EVOLUTIONARY CONSERVATION Evolutionarily conserved developmental genes and pathways play crucial roles in embryonic development across diverse organisms. The presence of these shared genetic mechanisms supports the idea of common ancestry and evolutionary conservation of developmental processes.

11. COMPARATIVE EMBRYOLOGY Early embryos of various organisms demonstrate evolutionary relationships As development proceeds, the traits of each species become more evident.

12. IMPORTANCE OF EMBRYOLOGY AS EVIDENCE OF EVOLUTION

13. THE IMPORTANCE OF EMBRYOLOGY: Understanding development - Embryology helps us understand how organisms grow and develop, from the simplest creatures to humans. Medical applications - This knowledge has numerous medical applications, including assisted reproductive technologies, prenatal diagnosis of birth defects, and regenerative medicine. Evolutionary insights - By studying the development of different species, embryology can shed light on evolutionary relationships and the history of life on Earth

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