Tag: biology

During fertilization, the haploid nuclei of the sperm and egg fuse to form a single diploid nucleus (the zygote nucleus), not two different nuclei.

The first step of fertilization is the penetration of the sperm into the egg, followed by the fusion of nuclei. The development of the zygote occurs after fertilization is complete.

Fertilization results in the formation of a single-celled zygote. The embryo is the developmental stage that follows subsequent cell divisions.

Fertilization typically takes place in the ampulla of the fallopian tube (oviduct), not in the uterus.

• During copulation (coitus) semen is released by the penis into the vagina (insemination). 
  
• The motile sperms swim rapidly, pass through the cervix, enter into the uterus and finally reach the ampullary region of the fallopian tube.
• The ovum released by the ovary is also transported to the ampullary region of fallopian tube where fertilisation takes place. 
  
• So, the correct option is 'Fallopian tube'.

When the egg nucleus and the sperm nucleus unites in the fallopian tube, it results in fertilization. And it results in the production of zygote or fertilized egg. Maturation is completed during the the gametogenesis (before the formation of egg / sperm) and the polar body is also formed during this process.
Thus, the correct answer is option C.

Fertilization occurs when the nucleus of both, a sperm and an egg fuse to form a diploid cell, known as a zygote. A zygote is a diploid cell resulting from the fusion of two haploid gametes; a fertilized ovum. An organism in the early stages of growth and differentiation, from fertilization to the beginning of the third month of pregnancy (in humans) is called as an embryo, after that, an embryo is called a fetus.

During copulation, semen is released by the penis into the vagina. The motile sperms swim rapidly, pass through the cervix, enter into the uterus and finally reach the junction of the isthmus and ampulla of the fallopian tube. the ovum released by the ovaries also transported to the ampullary-isthmus junction where fertilization takes place.

• A zygote is the fertilized egg that results from the union of male and female gametes. Once, the zygote is formed, 
• it undergoes mitotic divisions. Embryonal cells also divide by mitosis to produce more of its kind. The cells in the adult organism also divide by mitosis.

Mitosis is a type of cell division in which the chromosomes in a cell nucleus are separated into two equal sets of chromosomes, each in its own nucleus.

The egg is the female gamete and is haploid in nature containing 'n' number of chromosomes. Zygote is formed by the fusion of male and female gametes and is thus diploid in nature and contains '2n' number of chromosomes.
Thus, the correct answer is option A.