Related by context. Frequent words. (Click for all words.) 60 fruit fly Drosophila 59 nematode worms 59 melanogaster 58 hermaphroditic 58 Caenorhabditis elegans 58 sexual dimorphism 58 asexual reproduction 57 simian immunodeficiency virus 57 placental mammals 57 rhesus macaque monkeys 57 transgenic mouse 56 platypuses 56 T. gondii 56 symbiont 56 Toxoplasma 56 zebra finch 56 evolutionary origins 55 Wolbachia 55 nonhuman primates 55 pipefish 55 sex hormone estrogen 55 rhesus 55 reproduce asexually 55 mice lacking 55 multicellular organisms 54 monogamous 54 zebra fish 54 imprinted genes 54 C. elegans 54 vocalisations 53 unicellular 53 fibroblast cells 53 interspecies 53 mammalian species 53 morphologically 53 apoE 53 protozoan 53 cowbird 53 asexual 53 asexuality 53 naked mole rat 53 mammalian 53 FGF# 53 evolutionarily conserved 52 sociality 52 major histocompatibility complex 52 stickleback 52 kisspeptin 52 Drosophila melanogaster 52 Indohyus 52 Frans de Waal 52 genetically engineered mouse 52 prokaryotes 52 homologs 52 ribonucleic acid RNA 52 Anopheles gambiae 52 genetic alteration 52 protein encoded 52 hermaphrodites 52 subfamily 51 slime molds 51 amino acid sequences 51 gut microbes 51 herpes viruses 51 PrP 51 rhesus macaque 51 genetically altered mice 51 toadfish 51 ribozyme 51 sticklebacks 51 symbionts 51 mutant mice 51 HHMI investigator 51 courtship rituals 51 evolutionary psychologists 51 zebra finches 51 chimeric 51 elegans 50 evolutionarily 50 Drosophila 50 recessive genes 50 littermates 50 phylogenetic tree 50 diploid 50 Th2 50 unfertilized egg 50 IGF1 50 serotonin transporter gene 50 vasopressin 50 Klotho 50 gene expression patterns 50 homolog 50 haploid 50 basal cells 50 X chromosomes 50 germ cells 50 mouse embryos 50 serial monogamy 50 chimeras 50 homologous 50 hormone oxytocin