If one parent has brown eyes and it is dominant color over the blue eyes the other has what genotype must they both be to ensure that all kids have blue eyes. I need the answer as soon as possible

Which of the following factors would not contribute to allopatric speciation? a) a population becomes geographically isolated from the parent population.b) the separated population is small, and genetic drift occurs.c) the isolated population is exposed to different selection pressures than the ancestral population.d) different mutations begin to distinguish the gene pools of the separated populations.e) gene flow between the two populations is extensive.