What is Human embryo?

What is Human embryo?

  • An embryo is an early stage of development of a multicellular diploid eukaryotic organism.
  • In general, in organisms that reproduce sexually, an embryo develops from a zygote, the single cell resulting from the fertilization of the female egg cell by the male sperm cell.
  • The zygote possesses half the DNA of each of its two parents.
  • Human embryogenesis is the process of cell division and cellular differentiation of the embryo that occurs during the early stages of development.
  • In biological terms, human development entails growth from a one celled zygote to an adult human being.
  • Fertilisation occurs when the sperm cell successfully enters and fuses with an egg cell (ovum).
  • The genetic material of the sperm and egg then combine to form a single cell called a zygote and the germinal stage of prenatal development commences.
  • Embryogenesis covers the first eight weeks of development and at the beginning of the ninth week the embryo is termed a fetus.
  • Human embryology is the study of this development during the first eight weeks after fertilisation.
  • The normal period of gestation (pregnancy) is nine months or 38 weeks.

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