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← BACK A bacterial plasmid carrying genes that confer resistance to certain antibiotics.
Altruistic behavior between unrelated individuals; believed to produce some benefit to the altruistic individual in the future when the current beneficiary reciprocates.
A specific sequence of nucleotides at which a restriction enzyme cleaves a DNA molecule.
The idea that specific mating adaptations become fixed in a population and form the basis of species identification.
An offspring whose phenotype differs from that of the parents.
A DNA molecule made in vitro with segments from different sources.
The formation of new gene combinations; in eukaryotes, may be accomplished by new associations of chromosomes produced during sexual reproduction or crossing over; in prokaryotes, may be accomplished through transformation, conjugation, or transduction.
The archaeological artifacts and geological specimens sent to labs for radiocarbon dating are usually found embedded or buried with other materials that may have affected their radiocarbon content. Any carbon-containing material that affects the carbon 14 content of any given sample is therefore a contaminant. Important.… continue reading »
Aug 9, 2000. Radioactive Dating. The technique of comparing the abundance ratio of a radioactive isotope to a reference isotope to determine the age of a material is called radioactive dating. Many isotopes have been studied, probing a wide range of time scales. The isotope 14C, a radioactive form of carbon.… continue reading »
Believing Christians are among those actively involved in radiometric dating. This paper describes in relatively simple terms how a number of the dating techniques work, how accurately the half-lives of the radioactive elements and the rock dates themselves are known, and how dates are checked with one another. In the.… continue reading »