Fertilisation is defined as the fusion of the

• A. Fertilisation
• B. Gamete
• C. Chromosome
• D. Codon

Answer: (A)

Fertilisation is the fusion of the gametes. In sexual reproduction, a male gamete (sperm) and a female gamete (egg) come together, their haploid nuclei fuse, and the genetic material from both parents combines to form a zygote with a full diploid set of chromosomes. This event restores the chromosome number and creates the genetic mixture that can develop into a new individual. The other options aren’t describing this event: a chromosome is a structure that carries genes, and a codon is a three-nucleotide unit in mRNA used during protein synthesis, neither of which describes the merging of two gametes.