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  Encyclopedia of Keywords > Nature > Life > Animals > Zygote   Michael Charnine

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  1. A zygote is the beginning of a new human being (i.e., an embryo).
  2. The zygote is a very large cell, but the first waves of rapid cell division occur without increase in cell volume.
  3. A zygote is the beginning of a new human being.


  1. A blastocoele forms during embryogenesis when a zygote (a fertilized ovum) divides into many cells through mitosis.
  2. Animals: The embryo of a placental mammal is defined as the organism between the first division of the zygote (a fertilized ovum) until it becomes a fetus.
  3. Week 2 (day 1-7 of fertilization) Fertilization of the ovum to form a zygote.
  4. Animals: The embryo of vertebrates is defined as the stages between the first division of the zygote (a fertilized ovum) until it becomes a foetus.


  1. A zygote ( Greek: --------------) is a cell that is the result of fertilization.
  2. The zygote is characteristic of the last phase of fertilization and is identified by the first cleavage spindle.
  3. If the mother's hormones are not just right, that can prevent implantation, and the otherwise healthy zygote may be sloughed away.
  4. The zygote then produces the filamentous green algae which is haploid (1n).
  5. Homo zygote An organ ism that has two identical alleles of a gene.


  1. Zygote a companion website to the book: "Developmental Biology" 5th edition by Scott F. Gilbert.
  2. The human zygote is a totipotent cell.
  3. A biparental zygote is a Chlamydomonas zygote that contains chloroplast DNA ( cpDNA) from both parents.
  4. Die Zygote beginnt unmittelbar nach der Besamung sich zu teilen.
  5. In plants, the gametophyte nourishes the zygote and young sporophyte.
  6. Congressman Jerrold Nadler (D-NY) compared all unborn babies to the first stage of their development, a zygote.


  1. Early developmental staging from the zygote stage to the gastrula is a basic step for studying embryonic development and biotechnology.
  2. The same trend can be found in embryogenesis---spherical zygote, radial gastrula, bilateral embryo and triaxial asymmetric child.

Fallopian Tube

  1. The zygote spends the next few days traveling down the Fallopian tube.
  2. The dividing zygote gets pushed along the Fallopian tube.


  1. Reik, W. and Walter, J. (2001) Evolution of imprinting mechanisms: the battle of the sexes begins in the zygote.
  2. Pre-embryonic development Zygotes through gastrulation: Pre-embryonic development begins with zygote formation and ends with gastrulation.

Called Zygote

  1. It starts with the fertilization of the ovum, which is then called a zygote.
  2. That is, two haploid cells---usually an ovum from a female and a sperm cell from a male ---merge into a single diploid cell called the zygote (or zygocyte).

Sexual Reproduction

  1. The formation of a single-celled zygote through the union of male and female gametes that occurs in sexual reproduction.
  2. Definition: Haploid reproductive cells that unite during sexual reproduction to form a diploid zygote.


  1. During the next stage, cleavage, mitotic cell divisions transform the zygote into a tiny ball of cells called a blastula.
  2. In animals, the development of the zygote into an embryo proceeds through specific recognizable stages of blastula, gastrula, and organogenesis.
  3. A zygote initially develops into a hollow sphere, called a blastula, which undergoes rearrangement and differentiation.
  4. The blastula is a hollow, fluid-filled ball of cells that develops from the zygote of Metazoans.
  5. A blastula is a hollow ball of cells formed from the rapid cleavage divisions of the zygote.


  1. During this process, the total size of the embryo (also called a " zygote ") does not increase, so each division results in smaller and smaller cells.
  2. The zygote is surrounded by a strong membrane of glycoproteins called the zona pellucida which the successful sperm has managed to penetrate.
  3. By approximately four days after fertilization, the zygote has about 100 cells and is called a blastocyst.
  4. In humans, after about three days, the zygote has formed a solid mass of cells by mitotic division, called a morula.

Zygote Undergoes

  1. The zygote undergoes cleavage, increasing the number of cells within the zona pellucida.
  2. As the zygote undergoes mitotic divisions the germ plasm is ultimately restricted to a few cells of the embryo, these germ cells then migrate to the gonads.


  1. In organisms that reproduce sexually, once a sperm fertilizes an egg cell, the result is a cell called the zygote that has all the DNA of two parents.
  2. Half of the genetic information residing in the zygote's nucleus comes from the mother's egg nucleus, and the other half from the nucleus of a single sperm.
  3. The egg and sperm then fuse and form a zygote (2n).
  4. One cell fuses with the egg, producing the zygote that will develop into the sporophyte.
  5. It is carried in fluid called semen, and is capable of fertilising an egg cell to form a zygote.

Cell Division

  1. Within hours of conception the fused gametes, a zygote, undergoes cell division.
  2. The morula is produced by embryonic cleavage , the rapid cell division of the zygote with virtually no growth.
  3. Meiosis that takes place within the first few division s after zygote formation; thus all stages in the life cycle other than the zygote are haploid.

Genetic Material

  1. The first sperm that penetrates fully into the egg donates its genetic material ( DNA). The resulting combination is called a zygote.
  2. The single fertilized ovum supplies to the zygote all aspects (particularly cytoplasm and any outer structures) except one-half of the genetic material.


  1. Embryology refers to the development of the fertilized egg cell ( zygote) and its differentiation into tissues and organs.
  2. Indeed, the renowned dean of human embryology, Bradley Patten, used the term embryo for every stage subsequent to the fertilized ovum (zygote).


  1. The zygote then implants it self into the uterine wall which is very thick.
  2. The zygote then implants itself in the wall of the uterus, where it begins the processes of embryogenesis and morphogenesis.

Female Gamete

  1. The fusion of a male and female gamete produces a zygote, from which a new individual develops.
  2. For a short time period every month, the female gamete is readily available to be fertilised by sperm, to form a zygote.

Male Gamete

  1. Zygotic embryogenesis in animals and plants starts with the fusion of the haploid female and male gametes, giving rise to a diploid zygote.
  2. Sperm The male gamete The single fertilizing sperm supplies to the zygote no aspects except one-half of the genetic material.


  1. Fusion of the sperm with the ovacyte occurs in the Fallopian tube and the resulting diploid zygote becomes embedded in the uterus wall.
  2. Homo zygote cells are diploid or polyploid and have the same alleles at a locus (position) on homologous chromosomes.
  3. During 'fertilization', haploid gametes come together to form a diploid zygote and the original number of chromosomes (2n) is restored.


  1. Normally, the endometrium progresses to the secretory phase of the menstrual cycle as the zygote forms, undergoes cleavage, and enters the uterus.
  2. Estrogen and progesterone stimulate the development of the endometrium and preparation of the uterine inner lining for implantation of a zygote.


  1. Conceptus Conceptus (latin is conceptio, derivatives of zygote) denotes the embryo and its adnexa (appendages or adjunct parts) or associated membranes (i.e.
  2. The mammalian zygote gives rise to both the embryo and extraembryonic tissues, such as the placenta.


  1. Encyclopedia of Keywords > Nature > Life > Animals
  2. Humans > Medicine > Anatomy > Organs
  3. Encyclopedia of Keywords > Society > Humans
  4. Glossaries > Glossary of Developmental Biology /
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  Originally created: February 19, 2008.
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