Charak Samhita
शुक्राधिकं द्वैधमुपैति बीजं यस्याः सुतौ सा सहितौ प्रसूते। रक्ताधिकं वा यदि भेदमेति द्विधा सुते सा सहिते प्रसूते ॥१३॥
When the zygote with dominance of sperm is bifurcated , the woman delivers male twins and when the one with dominance of ovum is getting bifurcated, female twins are born.
english translation
1.
कतिधापुरुषीयशारीरम्
Katidhapurusha Sharira (knowledge Of Holistic Human Being)
अतुल्यगोत्रीयशारीरम्
Atulyagotriya Sharira (different Clans And Aspects Of The Human Birth)
3.
खुड्डिकागर्भावक्रान्तिशारीरम्
Khuddika Garbhavakranti Sharira (factors Responsible For Embryogenesis)
4.
महतीगर्भावक्रान्तिशारीरम्
Mahatigarbhavakranti Sharira (detail Description On Embryonic Development)
5.
पुरुषविचयशारीरम्
Purusha Vichaya Sharira (detailed Study Of Holistic Human Being)
6.
शरीरविचयशारीरम्
Sharira Vichaya Sharira (analytical Study Of The Human Body)
7.
शरीरसङ्ख्याशारीरम्
Sharira Sankhya Sharira (numerological Account Of Human Body Constituents)
8.
जातिसूत्रीयशारीरम्
Jatisutriya Sharira (obstetrics, Maternal Health And Neonatal Care)
शुक्राधिकं द्वैधमुपैति बीजं यस्याः सुतौ सा सहितौ प्रसूते। रक्ताधिकं वा यदि भेदमेति द्विधा सुते सा सहिते प्रसूते ॥१३॥
When the zygote with dominance of sperm is bifurcated , the woman delivers male twins and when the one with dominance of ovum is getting bifurcated, female twins are born.
english translation