From the standpoint of evolution, caring for old parents may be maladaptive, because they have ceased reproduction, so that the benefit for inclusive fitness may not be expected. Then why do we care for old parents? I...From the standpoint of evolution, caring for old parents may be maladaptive, because they have ceased reproduction, so that the benefit for inclusive fitness may not be expected. Then why do we care for old parents? In this study, the evolution of care for the elderly was examined, by using an evolutionary genetic model, in which pleiotropic constraints between behaviors expressed in different social contexts among family members were assumed. It was suggested that establishing a solid relationship with parents during infancy should be selectively favorable, even though old parents have to be cared for in the future, but that caring for old parents may be excluded from the population if this behavior imposes high costs on reproduction of the younger generation. Despite the diminishing numbers of individuals within the population, care for the elderly may not be readily selected against, but at the same time this may not contribute to the rate of increase in population size. The significance of discussing the behavior of elderly caring from the standpoint of evolutionary genetics was emphasized.展开更多
Based on the representative sample survey data of more than 1 000 farmers in 101 villages of 25 counties of 5 provinces in China,within the framework of family collective decision-making,this paper studied the effects...Based on the representative sample survey data of more than 1 000 farmers in 101 villages of 25 counties of 5 provinces in China,within the framework of family collective decision-making,this paper studied the effects and heterogeneity of childcare and elderly caring on the off-farm employment mode of rural couples. It found that caring the children younger than 3 years old significantly reduces the possibility of offfarm employment of rural couples;conversely,if there is 60-80 years old member in the family,it will significantly increase the possibility of off-farm employment of rural couples or the wives. Caring the children above 12 years old or the elderly older than 80 years old reduces the possibility of off-farm employment of the husbands. Whether there is preschool education service facility in the village has no effect on the off-farm employment of the couples.展开更多
文摘From the standpoint of evolution, caring for old parents may be maladaptive, because they have ceased reproduction, so that the benefit for inclusive fitness may not be expected. Then why do we care for old parents? In this study, the evolution of care for the elderly was examined, by using an evolutionary genetic model, in which pleiotropic constraints between behaviors expressed in different social contexts among family members were assumed. It was suggested that establishing a solid relationship with parents during infancy should be selectively favorable, even though old parents have to be cared for in the future, but that caring for old parents may be excluded from the population if this behavior imposes high costs on reproduction of the younger generation. Despite the diminishing numbers of individuals within the population, care for the elderly may not be readily selected against, but at the same time this may not contribute to the rate of increase in population size. The significance of discussing the behavior of elderly caring from the standpoint of evolutionary genetics was emphasized.
基金Supported by Project of National Natural Science Foundation(71861147003)
文摘Based on the representative sample survey data of more than 1 000 farmers in 101 villages of 25 counties of 5 provinces in China,within the framework of family collective decision-making,this paper studied the effects and heterogeneity of childcare and elderly caring on the off-farm employment mode of rural couples. It found that caring the children younger than 3 years old significantly reduces the possibility of offfarm employment of rural couples;conversely,if there is 60-80 years old member in the family,it will significantly increase the possibility of off-farm employment of rural couples or the wives. Caring the children above 12 years old or the elderly older than 80 years old reduces the possibility of off-farm employment of the husbands. Whether there is preschool education service facility in the village has no effect on the off-farm employment of the couples.
