Related by context. Frequent words. (Click for all words.) 64 interbred 59 inbreeding 58 genetic diversity 58 interbreed 56 crossbreeding 54 hybridization 54 lineages 52 genetically distinct 52 species 51 speciation 50 reassortment 49 avian influenza viruses 49 subspecies 48 prion disease 48 megafauna 48 selective breeding 48 genetically diverse 48 Homo sapiens 47 Neandertals 47 parthenogenesis 47 crossbred 46 genetically identical 46 matings 46 predation 46 cross pollination 45 domestication 45 hybridized 45 taxa 45 extirpated 45 humans 45 intermarriage 45 alga 45 domesticated 45 breeding 45 H#N# viruses 44 bee populations 44 infecting humans 44 common ancestor 44 ungulates 44 fallow deer 44 biota 43 breeding pairs 43 chimeras 43 warmer winters 43 hermaphrodites 43 mammals 43 quagga 43 recombination 43 domesticated animals 43 herds 43 mtDNA 43 intermingling 43 divergence 43 populations 43 introns 43 primates 42 wild fowl 42 offspring 42 Neanderthals 42 Y chromosomes 42 clonal 42 black footed ferrets 42 wolf populations 42 hatchery fish 42 evolutionary 42 mutation 42 eukaryotes 42 intermarried 42 genetically 42 mammal 42 organisms 42 nonnative species 42 captive bred 42 geneticists 42 crossbreed 41 primate species 41 carnivores 41 herbivores 41 meiosis 41 nesting pairs 41 bloodline 41 mammoths 41 ant species 41 Y chromosome 41 avian influenza virus 41 phylogenetic 41 reproductive biology 41 extinction 41 clade 41 genetic variation 41 quagga mussels 41 mute swans 41 prions 41 translocation 41 lineage 41 platypus 41 transgene 41 genetic defects 41 black footed ferret 41 avian virus 41 cloned embryo