Genetic variety yet speciation in zygotes

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Meiosis is the key process that generates genetic diversity in zygotes by passing on half of one parent's genes while preserving the overall DNA structure necessary for species continuity. During meiosis, approximately 40 crossover events occur, which reshuffle the genomes and create variations in the genes on each chromosome. This ensures that while the genetic information is varied, the essential phenotypic traits and overall genetic blueprint of the species remain intact.
Loren Booda
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How does meosis or mitosis achieve great genetic variety in zygotes (passing on just 1/2 of one parent's genes to the offspring), yet maintains the DNA structure of the vital phenotypes for the species?

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If you are talking about zygotes, you are talking about meiosis :)

It is said that about 40 cross-over events happen per meiosis, reshuffling the genomes. All the genes are still in order and thus the buildplan is still the same, just the variation of the genes itself are different on each chromosome.
 

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