Rashi on Genesis 36:15 and biology

2 Shvat 5770


Genesis, chapter 36, verse 15 says “These are Leah’s sons that she delivered to Jacob in Padan Aram and Dina his daughter…”.

Rashi explains: “The males he referred to Leah and the females to Jacob, to teach you that whenever a woman seeds first, she will deliver a male, and whenever a man seeds first the woman will deliver a female."

How Rashi’s commentary is explained biologically?

Is there any connection to the ovum and the sperm reaching each other to generate fertilization?


The Y chromosome lives less time than the X chromosome. So, if Y was produced earlier than X, there is more probability of getting the XX combination (female) than the XY combination (male).

עזרו להפצת התורה של הרב!

כתבו למנהל האתר
כל הזכויות שמורות. Ⓒ תשע"ג (2013)