SEXUAL reproduction a parent contributes HALF of his CHROMOSOMES.Half of the chromosomes are contributed by the mother and half by the father. In humans, there are 23 pairs of chromosomes (22 pairs autosomes and 1 pair sex chromosomes). 23 chromosomes come from father and 23 from mother.The type of reproduction in which the combination of genetic material of two individuals of different sexes TAKES place, is termed as sexual reproduction. Male and female gametes fuse to develop an offspring.The other type of reproduction is asexual reproduction in which only a single parent is involved.