The correct answer is option 1, Ribosome. Ribosomes do not possess their own genetic material encoding proteins.

Let`s examine the other options to understand why they are not the correct answer:

Option 2, Nucleus: The nucleus is often referred to as the control center of the cell. It contains the cell`s genetic material, DNA, which encodes proteins. The DNA in the nucleus is used as a template to produce different types of RNA, which are then used by ribosomes for protein synthesis.

Option 3, Mitochondria: Mitochondria are often called the "powerhouses" of the cell because they generate energy through cellular respiration. Mitochondria have their own genetic material in the form of mitochondrial DNA (mtDNA). This mtDNA encodes some essential proteins involved in energy production.

Option 4, Chloroplast: Chloroplasts are found in plant cells and are involved in photosynthesis. Like mitochondria, chloroplasts have their own genetic material called chloroplast DNA (cpDNA). This cpDNA encodes proteins necessary for photosynthesis.

In summary, ribosomes are unique in that they do not possess their own genetic material encoding proteins. They rely on the genetic material of the cell, specifically the DNA in the nucleus