Final answer:
The statement that reproduction is not possible until one year after the onset of puberty is typically false, as sexual maturity and the potential for reproduction can occur during puberty.
Step-by-step explanation:
The statement 'Reproduction is not possible in males or females until one year after puberty has begun' is generally False. The ability to reproduce can occur before one year after the onset of puberty, as the reproductive organs mature and become functional during this period.
Differentiation of the male and female reproductive systems occurs during the fetal period, with sexual maturity being achieved during puberty. In females, puberty can begin as early as 9 years of age, with the potential for reproductive capability within approximately 4 years.
For males, puberty typically starts around age 12 and can take about 6 years to complete. The timeline for the maturation of reproductive organs and the commencement of fertility can therefore be variable, and it is possible for both males and females to become capable of reproduction before one year has elapsed since the onset of puberty.