Dark grey. Dark grey horses will have a light black coat, mane and tail. Brown. Brown is a very common horse colour and sometimes it can be hard to tell if horses are brown or black. There coat, mane and tail will all be brown from a light tan colour to a dark chocolate colour.
Genetic variation is a fact that a biological system â individual and population â is different over space. It is the base of the genetic variability of different biological systems in space.Genetic variation is based on the variation in alleles of genes in a gene pool.It occurs both within and among populations, supported by individual carriers of the variant genes. Genetic variation is brought about by random mutation, which is a permanent change in the chemical structure of a gene.enetic variation is based on the variation in alleles of genes in a gene pool. It occurs both within and among populations, supported by individual carriers of the variant genes. Genetic variation is brought about by random mutation, which is a permanent change in the chemical structure of a gene.
Genetic variability (vary + liable-to or capable of change) is the ability, i.e. capability of a biological system â individual and population â that is changing over time. The base of the genetic variability is genetic variation of different biological systems in space.Genetic variability is a measure of the tendency of individual genotypes in a population to vary from one another, also.Variability is different from genetic diversity, which is the amount of variation seen in a particular population.The variability of a trait describes how much that trait tends to vary in response to environmental and genetic influences. Homologous recombination is a significant source of variability. 2  During meiosis in sexual organisms, two homologous chromosomes from the male and female parents cross over one another and exchange genetic material.