Related by context. Frequent words. (Click for all words.) 54 X chromosomes 49 X chromosome 47 Y chromosome 47 germline 46 maleness 46 hetero 46 zygote 46 APOE4 45 heterosexual males 45 unfeminine 45 alleles 45 imprinted genes 44 polyandry 44 polymorphism 44 heterozygous 44 lefty righty 44 thymine 44 diploid 44 masculine 44 amino acid sequences 44 male 43 allele 43 homozygous 43 procreative 43 DEAR CAROLYN 43 asexual 43 progestogen 43 femaleness 43 unpaired 43 invariant 43 hermaphrodites 43 chromosomal 43 Y chromosomes 42 genes 42 major histocompatibility complex 42 chromosomes 42 chimeric 42 primogeniture 42 ApoE4 42 BRCA2 gene 42 BRCA mutations 42 evolutionarily 41 heritable 41 behavioral traits 41 monogamous 41 pluripotent cells 41 gendered 41 Physiologically 41 BRCA1 gene 41 nucleotide 41 sociality 41 dissimilarity 41 genotype 41 singleton 41 ejaculates 41 feminised 41 rhesus 41 heterosexual 41 quadratic 40 genetically 40 fairer sex 40 conformations 40 females 40 symmetric 40 mutant gene 40 binary 40 female 40 tropism 40 genetically programmed 40 recessive gene 40 personality traits 40 polyamorous 40 Anglo Saxon Protestant 40 plurals 40 bilinguals 40 recessive 40 Wolbachia 40 BRCA 40 Oestrogen 40 human leukocyte antigen 40 transitive 40 shorter telomeres 39 mitochondrial genome 39 FOXP2 39 homology 39 vaginal secretions 39 hormones estrogen 39 cognate 39 essentialist 39 Drosophila melanogaster 39 sexless 39 haplotype 39 phenotype 39 testes 39 mechanistically 39 ie 39 genetic trait 39 chromosome 39 innate abilities 39 phyla 39 perimenopausal