How long a dog flea survives depends on several factors. The average flea survives a few days to two weeks without a food supply, and they can live much longer with a host.
Genotype, the genetic constitution of an organism. The genotype determines the hereditary potentials and limitations of an individual from embryonic formation through adulthood. Among organisms that reproduce sexually, an individualâs genotype comprises the entire complex of genes inherited from both parents.
Biologists refer to two basic expressions of variation, the genotype and the phenotype. The genotype is the genetic code of an organism; in organisms with nucleated cells (most multi-cellular plants, animals, and fungi), the essential code is found in the nucleus of each cell. Additional genetic codes reside in other components of the cell, such as mitochondria (in animals) and chloroplasts (in plants).