This discussion brings up the topic of achondroplasia, which is caused by a dominant allele. This brings up the question that there could be difference in the inheritance of dominant disorders vs recessive disorders in geriatric pregnancy. I would like to know if there is a greater risk for either dominant or recessive disorders in advanced age pregnancy, or if these disorders do not have any preference. It could be possible that as we age we lose the ability to produce healthy recessive genes as they are less likely to be expressed in the presence of a dominant gene. Two copies of this gene are fatal, so it is worth asking if children whose parents are of normal height can be born with achondroplasia. Given that this is a dominant heterozygous disorder, it makes sense that you would need to inherit this gene from at least one of your parents, but not both.