Gene flow is commonly defined as the movement and incorporation of alleles into a population. There are multiple factors that can influence this, but ones that are most dominant are vagility which is the species specific pattern of movement, patchiness which is habitat fragmentation, and finally dispersal. Some of these can either increase or decrease gene flow depending on the situation. For example, in juveniles we can see an increase in gene flow while in adults there is little to no gene flow.

Gene flow plays an important role in maintaining genetic diversity within populations. By introducing new alleles, it can reduce the effects of inbreeding and increase a population’s ability to adapt to environmental changes. However, gene flow can also reduce genetic differences between populations, preventing speciation by keeping populations genetically similar.

Gene flow typically occurs through migration of individuals or the movement of gametes, such as pollen carried by wind or pollinators. In animals, dispersal behaviors strongly influence how far alleles travel. In plants, seed dispersal and pollination strategies significantly impact allele movement.

My personal experience with this is actually vast. Since, I just loved being in the mountains so much, I always loved to look at the pretty flowers. Most of the range on the eastern side of the freeway of my hometown had some beautiful yellow flowers scattered all throughout while the other side of the freeway has white and purple flowers. When I got older, I could actually see both sides of the freeway have different colors of flowers as shown below.

The flowers as you can see turned to different colors. I would see the blending of the white, purple, and yellow flowers creating vastly different flowers. Later on, I learned this was possible through pollen as either bees carried it or even the wind creating the mixed population.