The skin, it is the largest organ, it is considered an organ because even though you see it as just “skin” it has functions such as protecting you from the sun and creating important proteins for your body
The correct term for on female arctic fox would be "organism". Although it should be noted that this depends somewhat on the context of the environment.
Inbreeding: inbreeding brings out more recessive alleles in a population, as they are more exposed and then eventually become more common.
Isolation: if a group of a species becomes isolated from another group of the species, these individuals mate with eachother and as the population of the isolated species grows, the recessive alleles will show.