Simplifying things greatly (as this guide aims to do, mostly), quantum dots are incredibly small particles. They range between 2 to 10 nanometers in diameter, which is equivalent to 50 atoms. Yes, atoms. You can't measure these things using your old school shatter proof ruler. It's this small size that gives quantum dots the unique properties to improve our tech.
A zygote is formed when the male gamete (sperm) fuses with the female gamete (ova). Each gamete (regardless of the sex) is marked with an n; indicating it to be a haploid. Therefore; sperm (n) + ova (n) = zygote (2n) [A zygote is a diploid; 2n]. n = 23 chromosomes.
The female gamete is considered a haploid cell because it only has a half-set of chromosomes. When it fuses with the sperm of another haploid cell, their chromosomes come together to complete the set, resulting in a diploid zygote, which has a full set of chromosomes.