What happens in part one of photosynthesis?

According to the cladogram, which organisms have roundworms as a common ancestor?

Agene pool: a) is the collection of all the alleles found in a single species b) is the collection of all the alleles found in a single population c) is the collection of all the chromosomes found in a single population d) is the collection of genes in a species that allow the individuals to swim

Genetic disorders can result when sister chromatids fail to seperate properly. during what phase is this problem most likely to occur?