Here's why:

* Telophase 1 is the final stage of meiosis I, the first division in the process of creating gametes (sex cells).

* Meiosis I is characterized by the separation of homologous chromosomes, which are pairs of chromosomes with similar genes.

* As a result, each daughter cell at the end of meiosis I receives only one chromosome from each homologous pair.

* Haploid means having only one set of chromosomes, in contrast to diploid cells which have two sets.

Therefore, the cells formed during telophase 1 are haploid because they contain only one copy of each chromosome, making them ready for the second division of meiosis, meiosis II.