>>44698706You need to study how they work. The chance of carrying two inactivated copies of the same gene is much lower with lower mutation loads, though you fail to consider that recessive genes aren't necessarily deleterious in the first place. The chances of these recessive mutations being found in an outbreeding population is only low initially, but over time the mutation load has increased to levels where the decrease in fertility due to mutations once again compensates for the rate at which they appear.
Inbred populations do not need much genetic diversity once saeptated from ancestral stock, benefiting most from hybrid vigour if they manage to integrate crossbred offspring resulting from crosses between the purebred stock and the hybrid homogametic offspring, 50 % will become homozygous for the
advantageous recessive trait, and could thus formally join the saeptated group.