Here's how it works:
* Gene Flow: The introduction of new genetic material from outside a population. This helps maintain genetic diversity.
* Inbreeding: Mating between closely related individuals. This increases the chance of offspring inheriting identical copies of genes from their parents, making them homozygous for that gene.
When there's no gene flow, inbreeding can have the following effects:
* Increased Expression of Recessive Traits: Recessive alleles are only expressed when an individual has two copies. Inbreeding increases the likelihood of offspring inheriting two recessive alleles, leading to the expression of potentially harmful or deleterious traits.
* Reduced Genetic Diversity: Lack of gene flow and continued inbreeding lead to a decrease in the variety of alleles within the population. This makes the population more susceptible to environmental changes, diseases, and other challenges.
In summary, inbreeding without gene flow can lead to an increase in homozygosity, which can result in the expression of recessive traits and a reduction in genetic diversity. This can have significant consequences for the health and survival of a population.
