If ' $A$ ' represents the dominant gene and ' $a$ ' represents its recessive allele, which of the following would be the most likely result in the first generation offspring when Aa is crossed with aa?

• A

  All will exhibit dominant phenotype.
• B

  All will exhibit recessive phenotype.
• Correct answer
  C

  Dominant and recessive phenotypes will be $50 \%$ each.
• D

  Dominant phenotype will be $75 \%$.

Hence, the correct answer is option: 'C'.