Question

Установите последовательность процессов эмбрионального развития позвоночных животных: А образование бластомеров в процессе дробления зиготы, Б закладка зачаточных органов зародыша В. слияние яйцеклетки и сперматозоида и образование зиготы Г развитие нервной пластинки Д формирование зародышевых листков

Answer 1

Вроде бы так:) В, А, Д, Г, Б.

Answer 2

Sequence of Embryonic Development Processes in Vertebrates

The embryonic development of vertebrate animals involves a series of complex processes that lead to the formation of various structures and organs. The sequence of these processes can vary slightly among different species, but here is a general overview:

A. Formation of Blastomeres during Zygote Cleavage: The first step in embryonic development is the division of the zygote into smaller cells called blastomeres through a process called cleavage. This division occurs through a series of mitotic cell divisions, resulting in the formation of a solid ball of cells called a morula. The morula then undergoes further divisions to form a blastula, which consists of a hollow ball of cells called blastomeres.

B. Formation of Germ Layers: After the blastula stage, the next step is the formation of the three germ layers: ectoderm, mesoderm, and endoderm. This process is known as gastrulation. During gastrulation, the blastula undergoes complex rearrangements, resulting in the formation of a structure called the gastrula. The ectoderm gives rise to the nervous system, skin, and other external structures. The mesoderm forms the muscles, skeleton, and internal organs. The endoderm develops into the lining of the digestive tract and other internal organs.

C. Formation of the Zygote through Fertilization: Fertilization is the process by which the egg cell (ovum) and sperm cell (spermatozoon) fuse together to form a zygote. This fusion combines the genetic material from both parents and initiates the development of a new individual. Fertilization usually occurs in the female reproductive tract, and the resulting zygote begins to undergo cell divisions.

D. Development of the Neural Plate: During embryonic development, the ectoderm undergoes further specialization to form the neural plate. The neural plate is a thickened region of cells that eventually gives rise to the central nervous system, including the brain and spinal cord. The formation of the neural plate is a crucial step in the development of the nervous system.

E. Formation of Embryonic Germ Layers: As mentioned earlier, the formation of the three germ layers (ectoderm, mesoderm, and endoderm) is a critical process in embryonic development. These germ layers give rise to different tissues and organs in the developing embryo. The ectoderm forms the nervous system, skin, and other external structures. The mesoderm develops into muscles, skeleton, and internal organs. The endoderm gives rise to the lining of the digestive tract and other internal organs.

It is important to note that the sequence and timing of these processes can vary among different vertebrate species. Additionally, there are many more intricate steps and processes involved in embryonic development that are beyond the scope of this brief overview.

I hope this information provides you with a general understanding of the sequence of embryonic development processes in vertebrate animals. Let me know if you have any further questions!