Related by context. Frequent words. (Click for all words.) 66 prairie voles 59 reproduce asexually 57 vaginal secretions 57 monogamous 57 reproductive abnormalities 56 meadow voles 55 pipefish 55 biologically programmed 55 MHC genes 55 fruitflies 54 coevolution 54 placental mammals 54 masculinization 54 multicellular organism 54 monotremes 54 flatworms 54 imprinted genes 53 parthenogenetic 53 monozygotic twins 53 By Laurie Kulikowski 53 prematurely abort 53 auklets 53 nonhuman primates 53 mole rats 53 unicellular 52 asexual reproduction 52 sexual dimorphism 52 chimpanzees gorillas 52 springtails 52 Relaxing laughing talking 52 T. gondii 52 invertebrate animals 52 asexuals 52 Candida species 52 recessive genes 52 commensal 52 wolf spider 52 frogs lizards 52 sex hormone estrogen 51 melanogaster 51 eukaryote 51 rat pups 51 aY chromosome 51 methylation patterns 51 chromosomal disorders 51 mandrills 51 metazoan 51 By HARVEY SIMPSON 51 asexually 51 mitochondrial DNA mtDNA 51 germline stem cells 51 haploid 51 protozoan parasite 51 Babesia 51 wolf spiders 51 nematode worms 51 Genetic mutations 51 chromosomal aberrations 51 polyandry 51 D. melanogaster 51 spotted hyenas 51 single celled organisms 51 serial monogamy 51 DRD4 gene 51 hermaphroditic 51 interspecies 51 Darwin finches 51 reproductively 50 pubic lice 50 Barn owls 50 Borrelia 50 ichthyosaurs 50 primate ancestors 50 developmental abnormalities 50 BY ALLEN GREGORY 50 monogamy 50 evolutionary origins 50 oxytocin hormone 50 Toxoplasma 50 protozoans 50 cowbird 50 autosomal recessive 50 lipin 50 komodo dragons 50 Xenopus 50 Dictyostelium 50 hormone secretion 50 urine saliva 50 sociality 50 duo TRVSDJ AM 50 nematode worm 50 behavioral traits 50 zebra finch 50 Paranthropus 50 naked mole rat 50 Wolbachia 50 Rickettsia 50 mole rat 50 contagious yawning 49 rhesus macaque monkeys 49 copulated