Floxed alleleplugin-autotooltip__default plugin-autotooltip_bigFloxed allele: an allele that has been engineered to contain two $loxP$ sites, such that when Cre recombinase is expressed, the allele undergoes recombination and deletes the sequence in between the $loxP$ sites.: an alleleplugin-autotooltip__default plugin-autotooltip_bigAllele: a version of a gene. Alleles of a gene are different if they have differences in their DNA sequence. that has been engineered to contain two $loxP$ sites, such that when Cre recombinaseplugin-autotooltip__default plugin-autotooltip_bigCre-$lox$ system: A site-specific DNA recombination system derived from bacteriophage P1. The enzyme Cre recombinase will drive DNA recombination between 34 bp-long $loxP$ sequences. Very commonly used in various reverse genetic experiments. is expressedplugin-autotooltip__default plugin-autotooltip_bigExpression: a term used to describe the idea that the function of a gene is apparent and can be observed. Genes may not always be expressed all the time in all places., the alleleplugin-autotooltip__default plugin-autotooltip_bigAllele: a version of a gene. Alleles of a gene are different if they have differences in their DNA sequence. undergoes recombinationplugin-autotooltip__default plugin-autotooltip_bigRecombination: Recombination can have slightly different meanings depending on context:

* In the context of genetic crosses (usually a dihybrid cross or a test cross), recombination refers to the phenomena where the phenotype of the F2 offspring is different than either parent (P generation). $lox$ and deletes the sequenceplugin-autotooltip__default plugin-autotooltip_bigSequence: the precise order of monomers in a polymer. In DNA, it refers to the order of G, A, T, and C nucleotides. In RNA, it refers to the order of G, A, U, and C nucleotides. In proteins, it refers to the order of amino acids. in between the $loxP$ sites.