Final answer:
In sexual reproduction, each parent contributes one set of 23 chromosomes to their offspring, resulting in equal genetic contributions from both parents.
Step-by-step explanation:
In sexual reproduction, each parent contributes one set of 23 chromosomes to their offspring.
These chromosomes are inherited during the moment of conception when the sperm and egg combine. Each set of chromosomes is made up of homologous pairs, which have genes for the same characteristics in the same location.
Therefore, each parent contributes an equal number of chromosomes, resulting in equal genetic contributions from both parents.