1/*
    2Program describing the Mendelian rules of inheritance of the color of pea
    3plants. It considers a family of two parents and a child.
    4The problem is, given the alleles of the parents, predict the
    5probability of the color (or of its alleles) of a pea plant.
    6From
    7H. Blockeel. Probabilistic logical models for mendel's experiments:
    8An exercise.
    9In Inductive Logic Programming (ILP 2004), Work in Progress Track, 2004.
   10*/
   11:- use_module(library(pita)).   12
   13:- if(current_predicate(use_rendering/1)).   14:- use_rendering(c3).   15:- endif.   16
   17:- pita.   18
   19:- begin_lpad.   20
   21mother(m,s).
   22father(f,s).
   23% family with 3 members: m is the mother of s and f is the father of s
   24
   25% cg(I,C,A) means that individual I has color allele A on chromosome C
   26% the color alleles are p and w and the chromosomes are 1 and 2
   27% color(I,Col) means that individual I has color Col
   28% Col can be purple or white
   29
   30cg(m,1,p).
   31cg(m,2,w).
   32cg(f,1,w).
   33cg(f,2,p).
   34% we know with certainty the alleles of the parants of s
   35
   36cg(X,1,A):0.5 ; cg(X,1,B):0.5 :- mother(Y,X),cg(Y,1,A), cg(Y,2,B).
   37% the color allele of an individual on chromosome 1 is inherited from its
   38% mother. The two alleles of the mother have equal probability of being
   39% transmitted
   40
   41cg(X,2,A):0.5 ; cg(X,2,B):0.5 :- father(Y,X),cg(Y,1,A), cg(Y,2,B).
   42% the color allele of an individual on chromosome 2 is inherited from its
   43% father. The two alleles of the mother have equal probability of being
   44% transmitted
   45
   46
   47color(X,purple) :- cg(X,_,p).
   48% if an individual has a p allele its color is purple, i.e., purple is
   49% dominant
   50
   51color(X,white) :- cg(X,1,w), cg(X,2,w).
   52% if an individual has two w alleles its color is white, i.e., white is
   53% recessive
   54
   55:- end_lpad.