The study data were obtained from a population of marmots ( Marmota marmota ) from the French Alps with data from 1990 to 2010. The highest rate of illegitimate children occurs when the two members of the dominant pair are either genetically very similar or very similar. different. “About 10% of the litters have at least one illegitimate child as a result of copulation with a non-dominant male. It is believed that females have this behavior because it can help to have a more genetically variable offspring ”, explains Mariona Ferrandiz. The dominant male, a choice of minimums Marmots are mammals that live in small groups of up to 20 individuals, where a priori only the dominant pair reproduces. Both males and females in the group have a very strong urge to become dominant, as they must otherwise

leave the group and the chances of surviving Azerbaijan Mailing Data the alpine winter alone are remote. The female chooses a male who has a set of genes related to the immune response (the Major Histocompatibility Complex, MHC) quite different from and compatible with hers. This will produce a more variable offspring, and with a greater possibility of response to parasites. This is the best card for the dominant male to prevent the female from copulating with other individuals. “In addition, this first selection does not take into account a second genetic aspect, consanguinity,” says Ferrandiz. Infidelity as an option to increase genetic variability When the dominant partner has a high degree of consanguinity or when it has a very similar MHC, the female chooses to correct it by being unfaithful and reproducing with other males that

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are probably more compatible with her at the genetic level. It is assumed that these will be males with a genome neither very nor little similar, and with an MHC quite different from that of the female. Otherwise, the children produced by a couple with high consanguinity and with similar MHC tend to have less genetic variability, which would probably lead them to be less fit for survival and have a poorer immune response. MHC is also often related to body odors How females detect these differences at the genetic level is not yet well understood. For other vertebrates, such as humans or other primates, the MHC has also been shown to participate in certain body odors and in mate choice. If this also happens with marmots, it could be a clue that females follow when mating. “This is the line of research that we want to follow from now on,

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