How is a zygote formed in humans?
Answers
Zygote
Single diploid eukaryotic cell formed by a fertilization event between two gametes
A zygote (from Greek ζυγωτός zygōtos "joined" or "yoked", from ζυγοῦν zygoun "to join" or "to yoke") is a eukaryotic cell formed by a fertilization event between two gametes. The zygote's genome is a combination of the DNA in each gamete, and contains all of the genetic information necessary to form a new individual. In multicellular organisms, the zygote is the earliest developmental stage. In single-celled organisms, the zygote can divide asexually by mitosis to produce identical offspring.
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Zygote is the first result formed after fusion of male and female gametes i.e. sperms and egg respectively .
Fertilization in humans complete in 3 steps :
Acrosomal reaction
Cortical reaction
Amphimixis
Acrosomal & cortical reactions include the breaking of membranes of egg by the sperm for its entry .
Amphimixis stage include Zygote formation .
Male & female nucleus fuse to form Synkaryon or Zygote .
Gametes are haploid in nature i.e only set of chromosomes are present . Fusion makes the combination of both chromosomes makes the zygote diploid . Further growth of zygote to human body has a diploid nature only .
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