These are passed down from parents during reproduction and are composed of individual strands of the DNA which contribute to the unique make up of you.

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Interpreting the description, the statement refers to genetic material that is inherited from parents and forms the basis of our individuality. 
Option 1: DNA — While DNA is the molecule that carries genetic information, the clue emphasizes inheritance through reproduction and the organized units that make up our chromosomes, not the molecule itself. DNA exists inside chromosomes and cells, but the phrase “passed down … composed of individual strands” points to the larger, organized structures rather than the molecule in isolation.
Option 2: Genes — Genes are specific segments of DNA that code for particular traits. The prompt mentions inheritance of the larger units that contribute to the unique makeup, but genes are components within chromosomes, not the carriers themselves that are passed down as units.
Option 3: Nucleus — The nucleus is the cellular compartment that houses DNA, not the hereditary units transmitted as a whole during reproduction. It’s a location, not the genetic material being described.
Option 4: Chromosomes — This is the correct choice. Chromosomes are the structures that are inherited from parents and are composed of DNA strands. They contain the genetic material that contributes to an individual’s unique traits and are the carriers passed down through reproduction.

APPSYCH141-034 Section 16 Quiz: Human Development

These are passed down from parents during reproduction and are composed of individual strands of the DNA which contribute to the unique make up of you.

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