A condition in which a person has 45 chromosomes is called ____________. aNullysomy bMonosomy cTrisomy dTetrasomy

Break Down the Problem

1. Identify the chromosome number abnormalities.
2. Understand the definitions of the given terms.

Relevant Concepts

• Nulllsomy: Absence of a chromosome pair (missing both chromosomes).
• Monosomy: Presence of only one chromosome from a pair (45 chromosomes total).
• Trisomy: Presence of three copies of a chromosome instead of the normal two (47 chromosomes total).
• Tetrasomy: Presence of four copies of a chromosome instead of the normal two (48 chromosomes total).

Analysis and Detail

• A normal human has 46 chromosomes (23 pairs).
• If a person has 45 chromosomes, they are missing one chromosome from the normal count.
• This condition matches with the definition of monosomy, where one member of a chromosome pair is missing.

Verify and Summarize

• Monosomy leads to a total of 45 chromosomes, confirming that the correct answer must represent that condition.

Final Answer

The answer is b) Monosomy.