Holland Lops are a dwarf breed, though not every dwarf Holland carries the dwarf gene. Gracie and Sir Lancelot, who are longer and much bigger then most Holland lops, are non-dwarfs, or "normals". Cinnamon, my petite, 3.2 pound Holland, is a true dwarf, which means she has 1 dwarf gene.
If I bred her to a buck that has a dwarf gene like she does, they would both have a 25% chance of producing a kit called a peanut. One in every 4 babies would have this chance, basically. That doesn't mean that in a litter of 8, 2 would be peanuts. Sometimes whole litters are only peanuts, sometimes there are no peanuts in a litter. A normal cannot produce a peanut, ever.
A peanut, getting a double-dwarf gene, has the inability to grow. The often don't grow fur and as their normal siblings grow big and strong, they don't grow at all. Often, they die within 2 weeks, more often within the first four days. Rarely will they open their eyes. Peanuts have deformed back legs, pinched HQ, oddly-shaped head, and tiny ears.
A max factor kit is a totally different gene. Recessive, like the peanut gene, but almost completely opposite. The max factor gene is much more rare then the peanut gene, but it does occur.
Max factors occasionally have opened eyes, deformed back legs, weird feet, and develop spiked or soft fur because they have no guard hairs. Not all max factors die. Some can live amazing pet lives as an adult. Usually, they will become blind because of the open eyes at birth.
Luckily I have not encountered any of the above babies, only healthy litters. But I am prepared for them.