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Sexual Reproduction
All metazoans, if or if not capable of propagating asexually, produce special cells termed as gametes. The gametes may be either male gametes or sperms or female gametes (ova). Syngamy follows throughout which a sperm fertilizes an ovum producing a zygote. The zygote develops and finally produces an adult. During syngamy, there is doubling of chromosomes; the zygote and its derivative cells are diploid. To prevent repeated doubling of chromosomes, there is meiosis or reduction division during the production of gametes. In this procedure chromosome number is reduced to half (haploid number). The cycle is repeated, and the chromosome number is maintained.
Regression of Primitive Streak As the inward migration of cells by the primitive streak ends progressively along its anterior to posterior regions the streak slowly regre
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scientific name of apple
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Bacteria never have a nucleus but some members of the domain Archaea are known to contain a true nucleus.
MECHANISM - 1 . AURICULAR SYSTOLE - First of all from complete body impure blood comes in R.A. by superior and inferior vena cava or pre and post cavals. Pure blo
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