zygote

Examples of zygote in the following topics:

• Cleavage of the Zygote

  • The process of cleavage is the step of embryogenesis where the zygote divides to produce a cluster of cells known as the morula.
  • Cell division with no significant growth that produces a cluster of cells that is the same size as the original zygote, is called cleavage .
  • Cells are more numerous and smaller at the animal pole of the zygote than at the vegetal pole.
  • In the case of monozygotic twins (derived from one zygote), a zygote divides into two separate cells (embryos) at the first cleavage division.
  • Dizygotic twins is the development of two embryos from two different zygotes.

• Fertilization

  • Fertilization occurs when a sperm and an egg have fused together to form a zygote, which begins to divide as it moves towards the uterus.
  • After the point of fertilization the fused product of the female and male gamete is referred to as a zygote or fertilized egg.
  • The fertilized egg, known as a zygote, then moves toward the uterus, a journey that can take up to a week to complete until implantation occurs.
  • Nondisjunction during the completion of meiosis or problems with early cell division in the zygote to blastula stages can lead to problems with implantation and pregnancy failure.
  • The sperm and ovum unite through fertilization, creating a zygote that (over the course of 8–9 days) will implant in the uterine wall, where it will reside over the course of 9 months.

• Female Duct System

  • This fluid contains nutrients for spermatozoa, oocytes, and zygotes.
  • The fertilized ovum, now a zygote, travels towards the uterus aided by the tubal cilia and tubal muscle.

• Tissue Development

  • In humans, fertilization of an egg leads to the formation of a zygote.
  • During the next stage, termed cleavage, mitotic cell divisions transform the zygote into a tiny ball of cells, called a blastula.
  • After about three days, the zygote forms a solid mass of cells by mitotic division, called a morula.

• Anatomy of the Female Reproductive System

  • The zygote then implants itself in the wall of the uterus, where it begins the process of embryogenesis and morphogenesis.

• Sperm

  • After fusion with egg cells during fertilization, a new organism forms, beginning as a totipotent zygote.

• Infertility

  • Possible problems could be that the egg is not released at the optimum time for fertilization, that it may not enter the fallopian tube, sperm may not be able to reach the egg, fertilization may fail to occur, transport of the zygote may be disturbed, or implantation fails.