biology

The scientific study of living organisms (humans, animals and plants) from the point of view of their structure and how they function and reproduce.

male

Symbol denoting that a being has male reproductive organs.

female

Symbol denoting that a being has female reproductive organs.

death

Symbol placed before a date denoting a person’s year of death.

blood factor negative

Individuals not carrying the Rh molecule (antigen) are Rh negative; the Rh factor plays an important role in pregnancy (the parents’ factors must be compatible).

blood factor positive

Individuals are Rh positive when their red blood cells carry an Rh molecule (antigen); the Rh factor is positive in about 85% of the population.

birth

Symbol placed before a date denoting a person’s year of birth.