21. Subsequently, variations of the experiment by Franklin Stahl revealed reciprocal dependencies between DNA replication and most genetic recombination . 22. His laboratory at Harvard currently investigates the biological and evolutionary nature of sexual reproduction, genetic recombination , and aging. 23. The aim of this genetic recombination in the laboratory is to develop a yeast strain that efficiently produces ethanol. 24. Estimates based on genetic recombination and mutation rates place the age of the allele between 1000 and 2000 years. 25. "' Genetic recombination "'is the production of offspring with combinations of traits that differ from those found in either parent. 26. As in many other eukaryotes, mating leads to genetic recombination , i . e . production of novel combinations of chromosomes. 27. "This is expected if there is genetic recombination but hard to explain in any other way, " the authors concluded. 28. To avoid the complications of sex and recombination, we initially restrict our attention to an asexual population without genetic recombination . 29. Analysis of genetic recombination is facilitated by the ordered arrangement of the products of meiosis in " Neurospora " ascospores. 30. In biology, Holliday junctions are a key intermediate in many types of genetic recombination , as well as in functional RNA molecules.