Below is shown a recombination intermediate between two non-sister chromatids (both strands of the double helix are shown for each hromatid with one chromatid shown in grey, the other in black). 3 1 a 1 1 and 2 1 and 4 2 and 4 1 and 3 3 and 4 2- 2 ↑ 1 4 -4 B b At the two Holliday junctions shown, breakage and and rejoining of DNA strands are needed to allow resolution of the junctions and subsequent separation of chromatids at the end of meiosis I. Which combination of breakage sites (numbered arrows) will result in creation of the recombinant chromatids, Ab and aB?
Genetic Recombination
Recombination is crucial to this process because it allows genes to be reassorted into diverse combinations. Genetic recombination is the process of combining genetic components from two different origins into a single unit. In prokaryotes, genetic recombination takes place by the unilateral transfer of deoxyribonucleic acid. It includes transduction, transformation, and conjugation. The genetic exchange occurring between homologous deoxyribonucleic acid sequences (DNA) from two different sources is termed general recombination. For this to happen, an identical sequence of the two recombining molecules is required. The process of genetic exchange which occurs in eukaryotes during sexual reproduction such as meiosis is an example of this type of genetic recombination.
Microbial Genetics
Genes are the functional units of heredity. They transfer characteristic information from parents to the offspring.
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