Question

WHAT IS ZYGOTE ? EXPLAIN IN DETAIL..
NO SPAMMING PLEASE ❌ ​

Answer 1

During sexual reproduction,when the sperms reach the egg,it penetrates inside the ovum.

syngamy (fusion) of male and female nuclei occurs to form zygote

Answer 2

Definition

➛ A zygote is a eukaryotic cell formed by a fertilization event between two gametes.

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Formation of Zygote

✧ The first stage of mitotic division occurs where genetic information is exchanged and chromosomes are paired, resulting in DNA replication at the spindle apparatus of the equator brought about by – the spermatozoa (centrioles) and the oocyte contributing the mitochondria.

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✧ Thus, the first new cell – the zygote, with a chromosomal makeup of 2n4c is formed due to the alignment of chromosomes from both the sets at the spindle.

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Development of Zygote

➛The development of zygote takes place in several stages mentioned below:

1. The zygote rapidly divides after the first 12-24 hours of formation.
2. The cell mass forms a hollow ball during blastulation.
3. Cells start differentiating and form cavities.
4. The three germ layers form during gastrulation.
5. Formation of primitive streak followed by notochord formation.
6. Tubes are formed making a neurula.
7. The notochord forms the neural plate.
8. The neural plate folds to form a neural tube and neural crest.
9. The mesoderm is divided into axial, paraxial, intermediate and lateral plate mesoderm, which gives rise to different organs.

★ The zygote undergoes rapid mitotic division to make a lot of new cells.

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