* Heterozygotes (Gg): While the gg genotype is lethal, heterozygotes (Gg) often carry the g allele without showing any obvious signs of albinism. They appear normal and can reproduce, passing on the g allele to their offspring.
* Mutation: The g allele can arise spontaneously through mutations in the genes responsible for chlorophyll production. Even if rare, these mutations continuously introduce the g allele into the population.
* Genetic Drift: In small populations, random fluctuations in allele frequencies can occur. This is called genetic drift. Even if the g allele is slightly disadvantageous, it can become more common by chance in a small population.
* Balancing Selection: In some rare cases, the g allele might provide a subtle advantage in specific environments or under certain conditions. For example, in a shaded environment, the g allele might lead to increased resistance to a specific pathogen. This scenario is unlikely but not impossible.
In essence, the g allele persists because it's hidden in heterozygotes and can be reintroduced through mutation. Even though the gg genotype is lethal, the g allele can be passed on without any visible consequence in the heterozygous state.
