Meiosis I is the first stage of meiosis, which is a specialized type of cell division that produces gametes (sperm and egg cells). During meiosis I, the homologous chromosomes (one from each parent) pair up and exchange genetic material through a process called crossing over. This exchange of genetic material contributes to genetic diversity.

Meiosis II is the second stage of meiosis, which divides the sister chromatids (identical copies of a chromosome) into separate cells, resulting in four haploid gametes.

Therefore, humans do not carry out two types of meiosis. They only carry out meiosis I, which is followed by meiosis II.