"one single individual" is correct and can be used in written English.
It is commonly used when emphasizing the singularity or uniqueness of a person. Example: "Out of the entire crowd, only one single individual noticed the mistake in the presentation."
If the Tea Party rank-and-file had coalesced around one single individual early on, we would currently be in a three-man race (Romney, Paul, and the Tea Partier).
"Theoretically, if you have it on the Y," Prof Crisanti added, "one single individual could knock out an entire population".
Once he has established the context of his vision, Chekhov goes on to embody the contradictions of this superfluous class in one single individual.
Singleton polymorphisms carried in heterozygous status by one single individual were excluded from haplotype calculations as their location on either of the chromosomes cannot be reliably phased.
"WPP is a massive global success story but one single individual cannot possibly control those global operations," he said.
Or a conscious choice in favor of a state hierarchy built to fit one single individual?" the Moscow newspaper Komsomolskaya Pravda wondered late last month.
It seems to me that that's one of the distinctive things about this country - that it is built on single individuals, each one a precious individual.
Eight individuals participated in one single year, 3 individuals in two years and 11 individuals conducted actions in all 3 years (Table 2).
By organisms one might mean single individuals, groups of individuals, all the members of one species, the sum of many species, or the total mass of species (biomass) in an ecosystem.
Second, individuals in one single breed are easily clustered closely.
The standard neutral model makes several simplifying assumptions: in particular it makes the simple assumption that individuals form one single constant size population.
