The fragile male. Male zygotes are often formed at suboptimal times in fertile cycle.
James
W H
WH
D004198:Disease Susceptibility / Q000503:physiopathology*; D005260:Female; D005306:Fertilization / Q000502:physiology*; D006801:Humans; D008297:Male; D008597:Menstrual Cycle / Q000502:physiology; D012744:Sex Ratio; D015053:Zygote / Q000502:physiology*