Reciprocal altruism can be best explained with a model proposed by robert trivers in 1971. trivers hypothesized that if one individual (a) pays some cost to another individual (b), but the cost is recovered at some point in the future (when b a), then natural selection might favor behaviors that lead to this type of reciprocity. in which of the following situations is reciprocal altruism likely to occur?

Reciprocal altruism is one of the altruism behaviors in which an individual organism helps in increasing the fitness of another organism by reducing the fitness of itself temporarily in expectation of the same behavior from another organism in the future later.

It takes place in the same set of organism partners which is a continuous interaction ion in stable groups of organisms.

Thus, the correct answer would be - an ongoing interaction in the same set of partners.

an organism's phenotype is the  form of a trait  that it  displays. for  flowercolor, a pea  plant  can  display  a phenotype of purple or white flowers. an organism's  genotype  is the alleles of a gene it contains. based on his data, mendel concluded that a phenotype can be  determined  by more than one  genotype.