There are many examples of genes that contribute to instinctual behavior across different species. Here are a few examples with a brief overview of their mechanisms:

1. Fruit fly courtship behavior: In fruit flies, male courtship behavior is largely instinctual and is controlled by a set of genes, including fruitless (fru) and doublesex (dsx). These genes regulate the development of specific neurons in the fly brain that are responsible for generating and processing courtship signals. The fru and dsx genes produce transcription factors that activate the expression of other genes involved in the development of these neurons, leading to the production of specific courtship behaviors.

2. Parental behavior in mice: In mice, the gene responsible for maternal behavior is called fosB. This gene is expressed in specific regions of the brain in response to the presence of offspring, leading to the production of nurturing behaviors such as nest-building and grooming. The fosB gene codes for a protein that regulates the expression of other genes involved in the formation of these neural circuits.

3. Song learning in birds: In songbirds, the development of learned vocalizations is controlled by a set of genes including FoxP2 and BDNF. These genes are expressed in specific regions of the brain involved in vocal learning and control, and are thought to regulate the formation of neural circuits that underlie song production. The FoxP2 gene codes for a transcription factor that regulates the expression of other genes involved in neural development and plasticity, while BDNF codes for a protein that promotes the growth and survival of neurons.

4. Fear response in mice: The gene responsible for fear response in mice is called stathmin. This gene codes for a protein that regulates microtubule dynamics in neurons, and has been shown to play a role in fear conditioning and memory formation. When mice are exposed to a fearful stimulus, stathmin is activated in specific regions of the brain, leading to changes in neuronal function and behavior.

These are just a few examples of the many genes and neural circuits that contribute to instinctual behavior in different species. While the details of these mechanisms can be complex, studying them can provide valuable insights into the underlying biology of behavior.
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