The Y chromosome-carrying sperm is best for conceiving a baby boy.
Here's why:
Human sex determination is determined by the sex chromosomes, X and Y. Females have two X chromosomes (XX), while males have one X and one Y chromosome (XY).
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Egg Contribution: The egg always contributes an X chromosome.
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Sperm Contribution: The sperm can contribute either an X or a Y chromosome.
- X-bearing sperm + Egg (X) = Girl (XX)
- Y-bearing sperm + Egg (X) = Boy (XY)
Therefore, if you want a baby boy, you need the egg to be fertilized by a sperm carrying the Y chromosome.
It's important to note that naturally, you cannot choose which sperm fertilizes the egg. Sex selection methods exist, but these are typically associated with assisted reproductive technologies and have ethical considerations.