what is zygote with structure
Answers
Answer:
Zygote, fertilized egg cell that results from the union of a female gamete (egg, or ovum) with a male gamete (sperm). In the embryonic development of humans and other animals, the zygote stage is brief and is followed by cleavage, when the single cell becomes subdivided into smaller cells.
Explanation:
A zygote is the first diploid cell that is formed by the fusion of male and female gametes resulting in the formation of an embryo.
The zygote stage development occurs in the first week of fertilization. The genome of the zygote is the combination of DNA in each gamete and contains all the genetic information required to form an individual.A zygote is a fertilized ovum. The germ cells undergo meiosis to reach a haploid state (n) as part of spermatogenesis and oogenesis. The sperm and the unfertilized ovum reinstates a chromosome set in zygote in a diploid state (2n).
After fusing with the sperm, the second stage of meiosis takes place for separation of chromatids. Post-fertilization, mitosis of the zygote is initiated which develops into a mature offspring exhibiting characteristics of its parent.
In the course of the menstrual cycle, ovulation occurs through one of the ovaries after 14 days of the cycle after which the ovum proceeds towards the fallopian tube. Sperm enters through the cervix to reach the fallopian tube where fertilization is facilitated by the lining of the cells. These linings project tiny needle-like structures called the cilia, which propel the zygote to the uterus to form a blastocyst (ball of cells) where cells undergo divisions.
If fertilization does not occur, the zygote moves down to the uterus resulting in the onset of menstruation.
Zygote serves as a vital link ensuring species continuation from the present to the next generation. Every sexually reproducing entity initiates life processes with the formation of zygote.
Zygote forms the first stage in the development of a unique entity. It contains all the vital factors essential for the development as they occur as an encoded set of information in the makeup of chromosomes.
The activation of the zygote to produce proteins occurs only after it undergoes a series of divisions into cleavage. The formation of blastomeres serves as building units for the potential organism.
It is a result of the formation of the zygote that the diploid cell is formed containing DNA information. It is during this stage, that the chromosomal gender of the new individual is decided. Zygote formation also brings about cleavage division for the stage of embryogenesis.
