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.
The modern genetic definition of biological evolution is A. change from one species to another by the natural selection of individual variation B. mutation causes variation and variation is selected for by the environment C. survival of the fittest D. a change in allele frequencies from one generation...iological evolution is defined as the change in allele frequencies (where alleles are versions of the same gene that differ in their base sequence) within populations (Freeman and Heron, 2004) http://www.calstatela.edu/faculty/pnargu...