Sexual reproduction: Meiosis Germ cells undergo two special nuclear divisions with only one chromosome replication These meiotic divisions reduce the number of chromosomes in the gametes Chromosome behavior in meiosis is the first evidence that genes reside on chromosomes.Sexual reproduction: Meiosis • Germ cells undergo two special nuclear divisions with only one chromosome replication. • These meiotic divisions reduce the number of chromosomes in the gametes. • Chromosome behavior in meiosis is the first evidence that genes reside on chromosomes