You conceived a girl because a sperm carrying an X chromosome fertilized your egg, which always carries an X chromosome, resulting in an XX chromosome combination.
Here's a more detailed explanation:
-
The Basics: The sex of a baby is determined by the chromosomes contributed by the sperm and the egg.
-
The Egg's Role: An egg cell from the mother always contains an X chromosome.
-
The Sperm's Role: A sperm cell from the father can contain either an X chromosome (female) or a Y chromosome (male).
-
The Combination:
- If a sperm carrying an X chromosome fertilizes the egg (X), the resulting combination is XX, and a baby girl is conceived.
- If a sperm carrying a Y chromosome fertilizes the egg (X), the resulting combination is XY, and a baby boy is conceived.
| Chromosome from Egg | Chromosome from Sperm | Resulting Combination | Baby's Sex |
|---|---|---|---|
| X | X | XX | Girl |
| X | Y | XY | Boy |
In your specific case, according to the reference information, if they are XX a baby girl is conceived. Therefore, the sperm that fertilized your egg carried an X chromosome, leading to the conception of a girl (XX).
