Answer :

ZyanneUSAF
A. Chromosome. A chromosome is a physical unit of an organism's genetic code.

B. A genome is not a "unit" of the genetic code.
C. RNA is not part of the genetic code.
D. A gamete is not part of the genetic code

A major unit of the genetic code is called a(n) _____. chromosome genome RNA gamete

Answer:

chromosomes

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