The creature may have come to have sex to fight 'cancer'
Many organisms, including humans, combine genes between different individuals, such as sex, and perform ' sexual reproduction ' to produce individuals with genes different from their parents. It was hypothesized that such sexual reproduction might be performed in many organisms to combat ' cancer .'
Transmissible cancer and the evolution of sex
This Wild New Hypothesis Says Sex May Have Evolved to Fight Certain Types of Cancer
Not all organisms on earth perform sexual reproduction, but many organisms reproduce by asexual reproduction . Some animals switch from sexual reproduction to asexual reproduction as appropriate, and it is not always the case that organisms can not flourish without sexual reproduction.
A definite advantage of asexual reproduction is that the cost for finding a spouse can be reduced, and in the case of sexual reproduction you can not leave offspring unless you find a spouse. In this respect sexual reproduction is less efficient than asexual reproduction, but researchers believe that there are certain advantages to this, as many organisms choose sexual reproduction .
The most popular theory of sexual reproduction is that the integration of unrelated spouse genes prevents harmful mutations from being passed on to offspring. In the case of asexual reproduction, if a mutation that is harmful to survival occurs in a gene, it will be passed directly to the offspring, making it difficult to resist the harmful mutation. In addition, theories such as 'the genetic diversity brought about by sexual reproduction increases the resistance to diseases and diseases' and 'the possibility of generating useful mutations for survival' are also advocated.
A research team at the University of Montpellier in France presented hypotheses about the new benefits brought about by sexual reproduction. The research team claims that sexual reproduction has spread in multicellular organisms, as reproductive by sexual reproduction can reduce “infectious cancer cells”.
Normally, all cells of multicellular organisms work for the survival of the organism, but mutant cancer cells work harmful to the organism and lead to death. Although some people are susceptible to cancer as a result of genetics, cancer does not spread from person to person, but some dogs and Tasmanian devils have contagious cancer .
The research team pointed out that asexual reproduction has the disadvantage that the infectious cancer is likely to spread because the genes of the organism do not change. It is said that sexual reproduction makes it difficult for infectious cancer to adapt to the species' immune system, and “the efficient way to prevent infectious cancer is to make unique offspring different from other individuals. It's about leaving, ”says the research team.
Although it is difficult to prove this hypothesis, the research team is convinced that this theory makes sense. 'Even considering the risk of cancer and the cost of doing sexual reproduction, choosing sexual reproduction is a less risky and more profitable offspring production method,' the research team claimed.