Final answer:
A conception with one X and one Y chromosome at the 23rd position will result in a male individual, as the Y chromosome is responsible for defining male sex characteristics.
Step-by-step explanation:
A conception that has one X and one Y chromosome in the 23rd position will become an individual who is male. The presence of the Y chromosome determines maleness, as the genetic makeup will be XY, which is the typical chromosomal basis for a male individual. The X chromosome provided by the mother and the Y chromosome from the father ensure the development of male characteristics and reproductive anatomy.