It occurs at chiasmata (kye-AZ-muh-tuh).
A form of this process first observed in Drosophila can result in twin spots. The attP and attB system for this process involves the lambda phage int protein, and other namesake tyrosine-based enzymes facilitating it include FLP. A strain expressing a P1 phage enzyme under a specific promoter is crossed with a strain expressing a "floxed" gene of interest in a site-specific technique using this process called Cre-Lox. It occurs at chiasmata (kye-AZ-muh-tuh). The Holliday model describes the "homologous" form of this process, which happens in prophase I between chromatids. For 10 points, name this exchange of genetic material between chromosomes that may occur during meiosis.
A form of this process first observed in Drosophila can result in twin spots.
recombination [or crossover; or recombineering; prompt on genetic engineering] &lt;Smart&gt;