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- https://bio.libretexts.org/Bookshelves/Introductory_and_General_Biology/General_Biology_2e_(OpenStax)/07%3A_Unit_VII-_Animal_Structure_and_Function/7.11%3A_Animal_Reproduction_and_Development/7.11.07%3A_Fertilization_and_Early_Embryonic_DevelopmentThe process in which an organism develops from a single-celled zygote to a multi-cellular organism is complex and well-regulated. The early stages of embryonic development are also crucial for ensurin...The process in which an organism develops from a single-celled zygote to a multi-cellular organism is complex and well-regulated. The early stages of embryonic development are also crucial for ensuring the fitness of the organism.
- https://bio.libretexts.org/Courses/Thompson_Rivers_University/Principles_of_Biology_II_OL_ed/03%3A_Systematics_Phylogeny_and_Biological_Diversity/3.04%3A_Biological_Diversity/3.4.06%3A_Kingdom_Animalia_-_AdaptationsAnimals are primarily classified according to morphological and developmental characteristics, such as a body plan. One of the most prominent features of the body plan of true animals is that they are...Animals are primarily classified according to morphological and developmental characteristics, such as a body plan. One of the most prominent features of the body plan of true animals is that they are morphologically symmetrical. This means that their distribution of body parts is balanced along an axis. Additional characteristics include the number of tissue layers formed during development, the presence or absence of an internal body cavity, and other features of embryological development, suc
- https://bio.libretexts.org/Workbench/Principles_of_the_Human_Body/12%3A_Human_Growth_and_Development/12.3%3A_Embryonic_StageIn many cultures, marriage - along with birth and death - is considered the most pivotal life event. For pioneering developmental biologist Lewis Wolpert, however, these life events are overrated. Acc...In many cultures, marriage - along with birth and death - is considered the most pivotal life event. For pioneering developmental biologist Lewis Wolpert, however, these life events are overrated. According to Wolpert, "It is not birth, marriage, or death, but gastrulation, which is truly the most important time in your life." Gastrulation is a major biological event that occurs early in the embryonic stage of human development.
- https://bio.libretexts.org/Bookshelves/Introductory_and_General_Biology/Biology_(Kimball)/14%3A_Embryonic_Development_and_its_Regulation/14.01%3A_Embryonic_DevelopmentThis page outlines embryonic development in animals, which includes four stages: Cleavage (rapid cell division of the zygote), Patterning (cell organization and body axis establishment), Differentiati...This page outlines embryonic development in animals, which includes four stages: Cleavage (rapid cell division of the zygote), Patterning (cell organization and body axis establishment), Differentiation (activation of zygotic genes for specific cell types), and Growth. It emphasizes the transition from maternal mRNA to the embryo's genome. Research on frogs and snails illustrates the significance of mRNA distribution and protein gradients during early development.
- https://bio.libretexts.org/Courses/Butte_College/BC%3A_BIOL_2_-_Introduction_to_Human_Biology_(Grewal)/Text/23%3A_Human_Growth_and_Development/23.3%3A_Embryonic_StageIn many cultures, marriage — along with birth and death — is considered the most pivotal life event. For pioneering developmental biologist Lewis Wolpert, however, these life events are overrated. Acc...In many cultures, marriage — along with birth and death — is considered the most pivotal life event. For pioneering developmental biologist Lewis Wolpert, however, these life events are overrated. According to Wolpert, "It is not birth, marriage, or death, but gastrulation, which is truly the most important time in your life." Gastrulation is a major biological event that occurs early in the embryonic stage of human development.
- https://bio.libretexts.org/Bookshelves/Introductory_and_General_Biology/General_Biology_1e_(OpenStax)/7%3A_Animal_Structure_and_Function/43%3A_Animal_Reproduction_and_Development/43.6%3A_Fertilization_and_Early_Embryonic_DevelopmentThe process in which an organism develops from a single-celled zygote to a multi-cellular organism is complex and well-regulated. The early stages of embryonic development are also crucial for ensurin...The process in which an organism develops from a single-celled zygote to a multi-cellular organism is complex and well-regulated. The early stages of embryonic development are also crucial for ensuring the fitness of the organism.
- https://bio.libretexts.org/Bookshelves/Introductory_and_General_Biology/Map%3A_Raven_Biology_12th_Edition/52%3A_Animal_Development/52.03%3A_GastrulationThe process in which an organism develops from a single-celled zygote to a multi-cellular organism is complex and well-regulated. The early stages of embryonic development are also crucial for ensurin...The process in which an organism develops from a single-celled zygote to a multi-cellular organism is complex and well-regulated. The early stages of embryonic development are also crucial for ensuring the fitness of the organism.
- https://bio.libretexts.org/Bookshelves/Introductory_and_General_Biology/Map%3A_Raven_Biology_12th_Edition/52%3A_Animal_Development/52.01%3A_FertilizationThe process in which an organism develops from a single-celled zygote to a multi-cellular organism is complex and well-regulated. The early stages of embryonic development are also crucial for ensurin...The process in which an organism develops from a single-celled zygote to a multi-cellular organism is complex and well-regulated. The early stages of embryonic development are also crucial for ensuring the fitness of the organism.
- https://bio.libretexts.org/Bookshelves/Introductory_and_General_Biology/Biology_(Kimball)/14%3A_Embryonic_Development_and_its_Regulation/14.02%3A_Frog_EmbryologyThis page describes the development of frog eggs into tadpoles. After fertilization, the zygote undergoes cleavage and forms a blastula with smaller cells. Gastrulation creates germ layers for body ti...This page describes the development of frog eggs into tadpoles. After fertilization, the zygote undergoes cleavage and forms a blastula with smaller cells. Gastrulation creates germ layers for body tissues. The Spemann organizer prompts ectoderm development into neural tissue, essential for the brain and spinal cord. The tadpole hatches as a complete structure and continues to grow by feeding, incorporating organic matter.
- https://bio.libretexts.org/Bookshelves/Evolutionary_Developmental_Biology/Evolutionary_Developmental_Biology_(Rivera)/03%3A_Cleavage_and_GastrulationCleavage stages of embryogenesis are typically very similar across animals. During cleavage, a single cell embryo rapidly divides to form a ball of cells, called a blastula. This ball may be hollow in...Cleavage stages of embryogenesis are typically very similar across animals. During cleavage, a single cell embryo rapidly divides to form a ball of cells, called a blastula. This ball may be hollow inside, have a hollow region, or be fairly solid. Gastrulation refers to a time of great flux in animal embryos. During gastrulation the cells produced during cleavage begin to move relative to each other. As they move, they change their local environment and come into contact with new cells.
- https://bio.libretexts.org/Bookshelves/Introductory_and_General_Biology/Map%3A_Raven_Biology_12th_Edition/52%3A_Animal_Development/52.02%3A_Cleavage_and_the_Blastula_StageThe process in which an organism develops from a single-celled zygote to a multi-cellular organism is complex and well-regulated. The early stages of embryonic development are also crucial for ensurin...The process in which an organism develops from a single-celled zygote to a multi-cellular organism is complex and well-regulated. The early stages of embryonic development are also crucial for ensuring the fitness of the organism.
