Based on the statements, choose the correct option given below.
Statement-$I$: Allelic genes lead to individual differences within the species.
Statement-$II$: About $1000$ varieties of mangoes are found in India.

• A
  Statement-$I$ is incorrect but Statement-$II$ is correct.
• B
  Both Statement-$I$ and Statement-$II$ are correct.
• C
  Both Statement-$I$ and Statement-$II$ are incorrect.
• D
  Statement-$I$ is correct but Statement-$II$ is incorrect.