The development of specific sex organs, such as the presence of testes in human males and ovaries in human females is due to - inheritance.

The development of specific sex organs in humans, such as the presence of testes in males and ovaries in females, is indeed due to inheritance. This process is determined by the sex chromosomes that an individual inherits from their parents.

Here are the steps:

1. Humans have 23 pairs of chromosomes, one pair of which determines the sex of the individual. These are known as the sex chromosomes.

2. Females have two of the same kind of sex chromosome (XX), while males have two distinct sex chromosomes (XY).

3. During fertilization, a sperm cell (which carries either an X or a Y chromosome) fuses with an egg cell (which always carries an X chromosome).

4. If the sperm cell carries an X chromosome, the resulting combination is XX, and the individual develops as a female with ovaries.

5. If the sperm cell carries a Y chromosome, the resulting combination is XY, and the individual develops as a male with testes.

6. The Y chromosome carries a gene called SRY (sex-determining region Y) that triggers male development. If the SRY gene is present (as in XY individuals), testes develop. If it is not present (as in XX individuals), ovaries develop.

So, the presence of testes in males and ovaries in females is due to the inheritance of specific sex chromosomes and the genes they carry.