(a) Orange has polyembryonic seeds. The nucellar cells surrounding the embryo sac starts dividing and protrudes into the embryo sac and develops into many embryos. That is why, when a seed of an orange is squeezed, many embryos, instead of one are observed. 
(b) Yes, these embryos are genetically similar with parental characters. They are produced from nucellar cells by mitotic division. So, they are genetically similar.