After meiosis I, the resultant daughter cells have:

Let the DNA content of a haploid gamete be $C$.Parent cell in $G_1$: $2C$.Parent cell after $S$ -phase (and in $G_2/M_1$): $4C$.Meiosis I separates homologous chromosomes but sister chromatids remain together. Thus, each daughter cell has half the chromosome number ($n$) but the DNA content is halved from $4C$ to $2C$.Since a haploid gamete has $C$, the daughter cell after Meiosis I has twice the amount of DNA ($2C$).