Helicase molecules is active first in DNA replication. DNA helicase are enzymes capable of unwinding duplex DNA to provide the single- stranded DNA templates that are required in processes such as replication and recombination.all helicase separates the strands double mix helix using energy derived from hydrolysis nucleotide.
Different forms of a gene are called alleles.The alleles an individual has at a locus is called a genotype. The genotype of an organism is often expressed using letters. The visible expression of the genotype is called an organism's phenotype.