Final answer:
Sexual reproduction in a multicellular organism involves gametes forming a zygote, which will then divide to produce reproductive and somatic cells.
Step-by-step explanation:
Sexual reproduction in a multicellular organism involves specialized reproductive cells, called gametes, which come together to form a zygote that will divide to produce both reproductive and somatic cells. A point mutation in the DNA is considered a neutral mutation if it changes a nucleotide that leads to no phenotypic consequence; a point mutation is considered deleterious if it changes a nucleotide within a gene and causes the protein to be nonfunctional. Point mutations in DNA can be neutral or deleterious depending on their impact on phenotype.