Beckwith-Wiedemann syndrome (BWS) is a genetic condition in which infants are born larger than normal and have other medical problems associated with excessive growth during fetal development. About 20% of the cases of BWS are caused by uniparental disomy, in which both copies of a homologous pair of chromosomes come from the same parent. Chromosome 11 contains several genes known to affect fetal growth. Use the genetic conflict hypothesis to predict whether these children have two copies of chromosome 11 from their father or two copies of chromosome 11 from their mother. Paternal because the selective pressure on paternal alleles favors larger offspring. Maternal because the selective pressure on maternal alleles favors larger oftspring. Paternal because the selective pressure on paternal alleles favors smaller offspring. Maternal because the selective pressure on maternal alleles favors smaller offspring..