Fertilized eggs become zygotes, which develop into sporophyte embryos inside the archegonia. This fluid contains nutrients for spermatozoa, oocytes, and zygotes. Desiccation-resistant diploid zygotes are produced following successful fertilization. Spores and zygotes are examples of totipotent cells. Spermatozoa fuse with the ova in the fertilisation duct, where the zygotes are produced. After germination, the zygotes release up to 32 haploid daughter cells. The dynamic behaviour of mitochondria in living zygotes during maturation and meiosis in "Chlamydomonas reinhardtii". Monozygotic twins split into two zygotes at some time very early in the pregnancy. These rare biparental zygotes allowed mapping of chloroplast genes by recombination. The zygotes develop into oocysts of two types. Resultant zygotes develop into microscopic larvae that may be carried great distances by oceanic currents. The two eggs, or "ova", form two zygotes, hence the terms "dizygotic" and "biovular". The plant, i.e. the fertile hermaphrodite, is not able to produce zygotes after self-pollination occurs. The resulting frequency for the heterozygous zygotes is thus 2pq. Zygotes that receive two copies of the Hairless allele will never develop into puppies.