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When survival is in crisis, sex may be the solution to the problem. This is shown by a new study. Sex has to spend a lot of time and energy. Why does it evolve into a reproductive strategy? The new study provides new clues to answer this question. Biologists have found that in stressful environments, sexually-producing yeast adapt faster than asexual yeast. About a century ago, it was suggested that the reason why biology evolved sex is because sexual reproduction can increase the genetic diversity of offspring and accelerate natural selection. However, this theory has not been tested because it is very difficult to do this experiment because it is necessary to compare the efficiency of sexual reproduction and asexual reproduction under the same conditions. Matthew Goddard of the University of Auckland, New Zealand, and his collaborator at Imperial College London, successfully experimented with yeast. Normal yeast can either split new genetically identical cells and carry out asexual reproduction; it can also produce spores that carry only half of the mother's chromosomes, and “mating†other spores for sexual reproduction. Scientists genetically engineered yeast to lose sexual reproduction and then compared it to common yeast. Goddard's team found that both ordinary and modified yeasts have the same growth rate in environments with little stress. However, if the temperature is increased and salt is added to the medium to make the living environment worse, the sexually-producing yeast will grow faster than those of asexual reproduction. This result was published in Nature on March 31st. Goddard said that it confirms the ancient theory that sexual reproduction increases survival advantage by mixing genes. Sexual reproduction will regenerate genes faster, and new mutations will help organisms adapt to new environments faster. The research team next plans to study the specific mechanisms that this process plays in yeast. Goddard said: "We don't know yet about the specific characteristics of the potential mutations that are driving this adaptation," said Sarah Otto, an evolutionary biologist at the University of British Columbia in Canada. The experimental technique in this new study is "very. A great progress." She said: “This area is very unbalanced, there are too many different theories, and there are too few experimental data used to test the theory. I think this may set a new gold standard for experiments that test gender evolution.â€