The difference between 'keturunan' and 'penurunan'

In Malay, affixes are added to words to carry different meanings. For example, the word 'keturunan' means 'descendent' while the word 'penurunan' means 'fall or drop in something'.

Let me construct two sentences to show the difference in meaning between these two words.

1 Gopal berasal daripada keturunan India.
[Gopal is of Indian race.]
2 Penurunan harga komputer membolehkan lebih banyak orang memilikinya.
[The drop in the price of computers enables more people to own them.]