Final answer:
The question does not provide enough context to specifically identify which gene (Gene 1, Gene 2, etc.) encodes a protein necessary for eye development. Homeobox genes are known to regulate development and could be involved, but more specific information about the gene names and their functions is needed.
Step-by-step explanation:
To answer the question of which gene encodes a protein required for eye development, we need to consider the context provided. None of the figures or information you have referenced give a specific name like Gene 1 or Gene 2 to a gene responsible for eye development. However, they do mention several genes involved in eye color in Drosophila (fruit flies), and various other factors concerning gene regulation during development, such as homeobox genes. In the broader context of biology, homeobox genes are known to play a crucial role in the development of organisms, including eye development.
With the information given, it is not possible to accurately determine which gene from the options (Gene 1 through Gene 5) is responsible for the synthesis of a protein necessary for eye development. More specific genetic information is needed to correlate the names (Gene 1, Gene 2, etc.) with their functions.