"Is the primary sex ratio the same in all human populations at all times?" At least the secondary sex ratio naturally varies in human populations, being lowest

"Is the primary sex ratio the same in all human populations at all times?" At least the secondary sex ratio naturally varies in human populations, being lowest in African's and somewhat higher in most others, see [0] and many other references. Meiotic drive can effect which embryo's survive [1] & [2]. It's an intragenomic conflict where one copy of a gene is passed on to offspring more than the expected 50%. [0] http://www.cdc.gov/nchs/data/nvsr/nvsr53/nvsr53_20.pdf http://www.cdc.gov/nchs/data/nvsr/nvsr53/nvsr53_20.pdf. [1] https://westhunt.wordpress.com/2015/04/09/a-common-variant-linked-to-chromosomal-errors/ https://westhunt.wordpress.com/2015/04/09/a-common-variant-l... [2] http://www.unz.com/gnxp/human-uniqueness-is-not-unique/ http://www.unz.com/gnxp/human-uniqueness-is-not-unique/