Calculation of coefficients of relatedness:


DIPLODIPLOIDY
(almost all animals)

PARENTS:

MALE       FEMALE

C1C2     C3C4

POSSIBLE OFFSPRING

C1C3      C1C4      C2C3      C2C4

AVERAGE RELATEDNESS

PARENTS-OFFSPRING:  r = 0.5
SISTERS:  r = 0.5
BROTHERS-SISTERS:  r = 0.5
 
 
 
 

HAPLODIPLOIDY
(Hymenoptera)

PARENTS

MALE       FEMALE

C1     C3C4

POSSIBLE FEMALE OFFSPRING

C1C3      C1C4

POSSIBLE MALE OFFSPRING

C3      C4

AVERAGE RELATEDNESS:

MOTHER-DAUGHTERS:  r = 0.5
MOTHER-SONS:  r = 0.5
SISTERS:  r = 0.75
BROTHERS-SISTERS:  r = 0.25