A human male working in a government chemical testing lab is not able to produce viable sperm. His doctor suspects one of the chemicals he is exposed to is limiting his gamete development. The doctor examines the gametes resulting from meiosis and discovers all resulting cells maintain their chromosomes in tetrads. What chromosome number is the doctor seeing and what is the total chromatid number found. Considering the nuclear membrane has dissolved and the chromosomes are not found at the metaphase plate; propose a mechanism by which the chemical is disrupting meiosis.