Rh(D) negative blood is the result of a simple gene deletion It is of great interest in pregnancies when the blood type of the mother is Rh(D) negative and the fetus Rh(D) positive. There are many antigens in the Rh blood group system. When you lack all of them, you are Rh null. The D antigen decides whether or not you are rh negative. When you lack it (d), you are rh negative. When you have it (D), you are rh positive. The d (rh negative) gets inherited recessively. Two rh(D) positive heterozygotes (Dd) can have an rh(D) negative child.
More information:
http://rhnegative.bloodtypecalculator.com/
Popular articles:
https://www.rhesusnegative.net/staynegative/rh-negative-celebrities/
https://www.rhesusnegative.net/staynegative/are-you-rh-negative-and-highly-sensitive/
https://www.rhesusnegative.net/staynegative/is-there-a-basque-jewish-rh-negative-connection/
https://www.rhesusnegative.net/staynegative/genetics/
https://www.rhesusnegative.net/staynegative/thalassemia-and-rhd-negative-blood/