Why can you possess traits neither of your parents have? The relationship of genotype to phenotype is rarely as simple as the dominant and recessive patterns described by Mendel. As opposed to ...

When you see a dominant trait, the underlying genetic make-up can still be ambiguous. See how researchers use test crosses to find out the genotype behind the phenotype. The test cross is another ...

The single most important factor in U.S. military dominance is the country's powerful ... Our friends at GlobalSecurity.org created a chart that captures not just the scope, but the size of ...