Ontogeny Ontogeny These questions cover various aspects of ontogeny, including embryonic development stages, germ layer formation, genetic regulation, and developmental disorders. 1 / 10 Which developmental disorder is characterized by improper closure of the neural tube during embryogenesis, leading to defects such as spina bifida? Down syndrome Turner syndrome Neural tube defects Cystic fibrosis 2 / 10 The process by which cells become specialized in structure and function is known as: Cell adhesion Cell proliferation Cell migration Cell differentiation 3 / 10 What is the term for the programmed cell death that is essential for proper development and the removal of unnecessary cells? Necrosis Apoptosis Autophagy Senescence 4 / 10 In human development, the neural tube, which later forms the central nervous system, closes completely by which week of gestation? 3rd week 4th week 6th week 8th week 5 / 10 The homeobox (Hox) genes are important for: Determining the anterior-posterior axis of the embryo Controlling cell division and apoptosis Regulating metabolic pathways Mediating immune responses 6 / 10 Which signaling pathway is crucial for the regulation of somitogenesis during vertebrate development? Wnt signaling pathway Notch signaling pathway Hedgehog signaling pathway TGF-beta signaling pathway 7 / 10 Which of the following structures is derived from the ectoderm during embryonic development? Muscles Nervous system Heart Liver 8 / 10 During which stage of embryonic development does the formation of the three primary germ layers (ectoderm, mesoderm, and endoderm) occur? Cleavage Gastrulation Blastulation Organogenesis 9 / 10 The process by which a single fertilized egg divides and differentiates into various cell types is called: Morphogenesis Gametogenesis Embryogenesis Phylogenesis 10 / 10 Ontogeny is primarily concerned with: The evolutionary history of species The development of individual organisms The genetic similarities between species The ecological interactions of species Your score isThe average score is 0% 0% Restart quiz