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What would be the ratio of chromosome nu...

What would be the ratio of chromosome number between an egg and its zygote? How is the sperm genetically different from the egg?

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The ratio of chromosome number between egg· and its zygote is 1 : 2. An egg is a female gamete, it has haploid number of chromosomes. During fertilisation, it fuses with male gamete (also having haploid number of chromosomes) to form a zygote that has diploid number of chromosomes.
Sperms and eggs are genetically different in terms of nature of sex chromosome. The sperm contain either X or Y-chromosome whereas an egg will always have an X-chromosome.
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