https://www.nature.com/articles/s41467-024-47618-5

## Patrilineal segmentary systems provide a peaceful explanation for the post-Neolithic Y-chromosome bottleneck

the male effective population size of these populations (estimated from **the paternally transmitted Y chromosome**) **underwent a severe bottleneck** around 5000 years ago.

fijaos en cinta y sus amigos, encontraréis que son un poco "borbones" (los tipos, las tipas menos... bueno, las que no tapan con velos y tal para no salir mal paraos...)
en realidad, no habla de los amigos de cinta, sino de los indoeuropeos de hace 5000 años
la movida es que las explicaciones a la falta de diversidad del cromosoma Y se debe a "genocidios" (en plan los hunos arrasando todo hasta roma y esas cosas)

_Several authors have pointed out that **the interpretation of patterns in human genetic diversity needs to take into account fine-scale socio-cultural factors** highlighted by archaeological and anthropological studies. **The first socio-cultural model proposed to explain the Y chromosome bottleneck involved violent competition between patrilineal kin groups and the killing of large numbers of men.** Thus, Zeng et al. simulated a human population structured into competing patrilineal kin groups. In this model, kin groups—referred to as descent groups in the present article, following Fox’s terminology—are **genetically homogeneous for the Y-chromosome because men in the same group share a recent common paternal ancestor. Violent competition between these different patrilineal groups results in the extinction of certain groups.** By increasing the rate of loss of Y-chromosomal lineages and accelerating genetic drift, it induces a severe decrease of Y-chromosome diversity._

pero los autores del paper han dicho que igual eso no es del todo satisfactorio, ya que las sociedades de cazadores-reclectores no son violentos (que sepamos) y los sedentarios en ciudades y tal, presentan ciertas inconsistencias en cuanto a periodos de violencia (hubo picos en las edades de bronce y hierro, pero no correlacionan bien con el estancamiento del cromosoma Y)

hay una respuesta más satisfactoria:

_**patrilocality**, a residence rule whereby a married couple settles in the house of the husband or his father, has been shown to reduce local Y-chromosome diversity compared to mtDNA, because men remain in their native village while women migrate between villages with their mtDNA upon marriage._

_On the other hand, **matrilocality**, the rule according to which the couple settles near the wife’s place of birth, is known to reduce diversity on mtDNA compared to the Y chromosome within groups_

#### _Here we test the hypothesis that the Y-chromosome bottleneck is the result of a global shift towards patrilineal systems, associated with the transition to new subsistence systems on all continents over the past 12,000 years._

_We can therefore assume that the emergence of agro-pastoralism was accompanied by a change in the kinship system through the practice of patrilineality and patrilocality. Two main hypotheses have been advanced to explain the relationship between subsistence strategies and kinship systems. **According to structural functionalists, patrilocality and patrilineality arise when resources can be accumulated**._

pamm!!
aquí lo tenéis, la acumulación capitalista y el patriarcado, de la mano, produce regresión en el cromosoma Y

cómo os quedáis??

por cierto, los juden son matrilineales (no matrilocales), aquí os lo lanzo

el cuello de botella del "patriarcado"