Statement-$1$: Alleles are slightly different forms of the same gene.
Statement-$2$: The segregation of alleles is a random process and so there is $50$ percent chance of a gamete containing either allele.

• A
  Both statement-$1$ and statement-$2$ are correct.
• B
  Statement-$1$ is correct but statement-$2$ is incorrect.
• C
  Statement-$1$ is incorrect but statement-$2$ is correct.
• D
  Both statement-$1$ and statement-$2$ are incorrect.