Related by context. Frequent words. (Click for all words.) 53 matings 53 fertilization 51 asexual reproduction 48 mating 47 undifferentiated cells 47 fertilising 47 impregnation 46 embryo transfers 46 nitrogen fixation 46 copulation 46 spermatogenesis 46 mating rituals 46 germline 45 multicellular organisms 45 fertilize 45 fertilized 45 resorption 45 sociality 44 fertilizing 44 hermaphrodites 44 Fertilization 44 biological molecules 44 diploid 44 unfertilized eggs 44 reproductive hormones 43 oocytes 43 mycobacteria 43 hermaphroditic 43 mutagenesis 43 hybridization 43 cryopreserved 43 estrus 43 crossbreeding 43 female reproductive organs 43 selective breeding 43 courtship rituals 43 bacterial colonies 43 speciation 42 hormone injections 42 forbs 42 prokaryotes 42 fecundity 42 cichlids 42 laboratory experiments 42 oocyte 42 spermatozoa 42 IVF cycles 42 embryogenesis 42 mycelium 42 ovarian function 42 larval stage 42 nitrogen fixing 42 nutrient absorption 42 Fruit flies 42 molting 41 hybridisation 41 translocation 41 abiotic 41 unfertilized egg 41 follicles 41 somatic cells 41 cowbirds 41 genomic sequencing 41 interspecies 41 mating ritual 41 culturing 41 experiments 41 evolutionary adaptation 41 parthenogenesis 41 ovulate 41 females 40 reproductive tract 40 implantation 40 mouse embryos 40 feedings 40 gene splicing 40 zebra finches 40 gametes 40 ligation 40 crosslinking 40 mesenchymal cells 40 corticosterone 40 woody plants 40 offspring 40 copulate 40 reproductive biology 40 nestlings 40 catkins 40 polyandry 40 ungulates 40 infertility treatments 39 interfacial 39 fertilized eggs 39 chloroplast 39 Candida albicans 39 symbionts 39 imprinted genes 39 Physiologically 39 transgenes 39 melanogaster 39 selectively bred