What is embryogenesis in zebrafish?
Abstract. We describe a series of stages for development of the embryo of the zebrafish, Danio (Brachydanio) rerio. We define seven broad periods of embryogenesis–the zygote, cleavage, blastula, gastrula, segmentation, pharyngula, and hatching periods.
Why zebrafish is used in embryogenesis?
As zebrafish eggs are fertilised and develop outside the mother’s body it is an ideal model organism for studying early development. Zebrafish have a similar genetic structure to humans. They share 70 per cent of genes with us. 84 per cent of genes known to be associated with human disease have a zebrafish counterpart.
What is embryonic stage of fish?
Fish embryos go through a process called mid-blastula transition which is observed around the tenth cell division in some fish species. Once zygotic gene transcription starts, slow cell division begins and cell movements are observable. During this time three cell populations become distinguished.
What is the life cycle of zebrafish?
The zebrafish lifecycle is divided into four major periods: Embryo, larva, juvenile, and adult. The full life cycle from fertilized egg to adult is a quick 90 days. Early development occurs at a rapid, but predictable rate when the embryos are raised at 28 °C.
What are the characteristics of zebrafish?
The zebrafish is about 2.5 cm to 4 cm long. In its larval stages it is transparent and as it matures to an adult it develops stripes that run along the length of the body and look blue in colour. Males are slender and torpedo-shaped usually with a pink or yellow tinge.
What is 128 cell stage called?
Term information. Organism at the blastula stage – an early stage of embryonic development in animals. It is produced by cleavage of a fertilized ovum and consists of a spherical layer of around 128 cells surrounding a central fluid-filled cavity called the blastocoel.
What are the four stages of embryogenesis?
The four stages of embryonic development are morula, blastula, gastrula and organogenesis.
What do you mean by embryogenesis?
Embryogenesis is the process of initiation and development of an embryo from a zygote (zygotic embryogenesis) or a somatic cell (somatic embryogenesis). Embryo development occurs through an exceptionally organized sequence of cell division, enlargement and differentiation.