Question

which altered chromosome form happens when a portion of the chromosome is missing?

a.) deletion
b.) translocation
c.) inversion
d.) duplication

Explanation:

Identify the question's core concept

The question asks for the term describing an altered chromosome form where a portion of the chromosome is missing. This relates to structural Chromosomal Abnormalities.

Define each option's mechanism

• Deletion: Occurs when a segment of DNA or a portion of a chromosome is lost or missing.
• Translocation: Occurs when a piece of one chromosome breaks off and attaches to another chromosome.
• Inversion: Occurs when a segment of a chromosome breaks off, flips upside down, and reattaches.
• Duplication: Occurs when a portion of the chromosome is duplicated, resulting in extra genetic material.

Match definition to the correct term

Since the question specifies that a portion of the chromosome is "missing," this matches the definition of a deletion.

Answer:

• a.) Deletion (Correct answer)
• b.) Translocation
• c.) Inversion
• d.) Duplication