Story about space explorers whose children mutate to become cyclops and have minituare hands growing from wrists along with the regular rest of hand.

Story has a set of space explorers who visit various planets. One planet is technologically advanced where the denizens live in automated houses virtually alone and rarely go out to meet other denizens, although I think they would communicate via video-telephone, etc. Another world had natives who live in square dwellings I thin sort of laid out in a regular manner like a grid-work not right up next to each other and I believe they have a bigger version of their typical building where their god lives. The explorers experience that any newborn children have only one central eye and have a little hand growing out of each of their wrists at a right angle to the normal rest of their hands. The natives explain that their god decided somehow to improve the design of the humans.