Boner
The term for an intimate relationship between two different species is called interspecies relationship.
Connection
The term used to describe the twisted ladder shape of a DNA molecule is "double helix". This structure consists of two strands of nucleotides coiled around each other in a spiral shape.
Replication is the term used to describe the process of copying DNA. Or perhaps transcription.
The term for the distance and relationship between two tones in music is called "interval."
um Long-distance relationship?
Rapport is the medical term used to describe a relationship of understanding between two people.
Symbiotic defines the relationship between the employer and the employee.
The medical term is neuromuscular. This term refers to anything involving the relationship between nerves and muscles in the body.
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The relationship you describe is called an analogy.
ecology