Question

Write the number of chromosomes in trisomic and monosomic conditions in humans.

Hint:

Trisomy and monosomy result from errors in cell division (non-disjunction).

Answer 1

Step 1: Understand trisomy and monosomy.
Trisomy and monosomy refer to the conditions where an individual has an abnormal number of chromosomes, either having an extra chromosome (trisomy) or one less chromosome (monosomy).
Step 2: Normal human chromosome count.
Humans typically have 46 chromosomes, arranged in 23 pairs (22 pairs of autosomes and 1 pair of sex chromosomes).
Step 3: Number of chromosomes in trisomic and monosomic conditions.
- Trisomic condition: An individual has one extra chromosome. Therefore, the number of chromosomes is 47. - Monosomic condition: An individual is missing one chromosome. Therefore, the number of chromosomes is 45.
Final Answer: \[ \boxed{47 \text{ (Trisomic)}, 45 \text{ (Monosomic)}} \]