embryonic development egg

Embryonic Development - All the events which change a zygote into a fully developed organism is called embryonic development. The entire process of development is called embryogenesis. Von Bear is called the "Father of Modern Embryology". ..

All the events which change a zygote into a fully developed organism is called embryonic development. The entire process of development is called embryogenesis. Von Bear is called the "Father of Modern Embryology". Embryonic Development in..

A cocoon may contain many fertilised eggs. However, only one of them develops at the expense of the others. Development is direct. There is no larval stage. A fully grown young worm crawls out of the cocoon in about two or three weeks. The young worm resembles the adul..

Male Hippocampus (sea horse) carries the eggs in a brood pouch on its ventral abdominal wall. b) Animals such as earthworms, cockroach etc. lay their eggs in a protective eggs case or Ootheca, which is deposited at some well protected place. d) An interesting mode of p..

Parthenogenesis is a form of reproduction in which the ovum develops into a new individual without fertilisation. Natural parthenogenesis has been observed in many lower animals (it is characteristic of the rotifers), especially insects, e.g., the aphid. In many social insects, such as th..

. Development involves precisely coordinated series of events. Each gene is switched on in its turn, and then something resulting from the expression of that gene, or some environmental influence, switches on the next gene in the programme. The exact mechanism of differentiation is not fu..

It acts as an extra embryonic lung and helps in exchange of gases. It also plays an important part in embryonic respiration, excretion and nutrition by developing into a placen..

While the amniotic cavity is being formed, another cavity develops. This arises as an out growth from the hindgut which pushes its way into extra embryonic coelom. It is known as allanto..

The embryonic tissue layers formed during developmental stages in Eumetazoa, are called germ layers. All the adult structures develop from these germ layers. Animals in which only two primary germ layers develop (an outer ectoderm and an inner endoderm) are described a..

Cell Division - Cell division forms a mode of reproduction in unicellular organisms. In multicellular organisms it is responsible for embryonic development and growth of the adult organism. It is also involved in repair and regeneration. Both asexual and sexual reproduction requ..