What happens to the chromosome number at fertilization?
Understand the Problem
The question is asking about the changes in chromosome number that occur during the process of fertilization, specifically whether the number of chromosomes increases, decreases, or stays the same.
Answer
The zygote has 46 chromosomes after fertilization.
At fertilization, the chromosome number of the resulting zygote is restored to 46 chromosomes (23 pairs) when the egg and sperm fuse.
Answer for screen readers
At fertilization, the chromosome number of the resulting zygote is restored to 46 chromosomes (23 pairs) when the egg and sperm fuse.
More Information
In humans, each parent contributes 23 chromosomes during fertilization, resulting in the zygote having 23 pairs of chromosomes. This restores the diploid number of chromosomes, essential for normal development.
Tips
A common mistake is thinking the number remains halved or is added beyond 46. Remember, fertilization restores the diploid state.
Sources
- Learn Genetics - University of Utah - learn.genetics.utah.edu
- 5.1: Changes in Chromosome Number - Biology LibreTexts - bio.libretexts.org
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