Why are gene versions NOT all alike

Answer:
This is due to genetic variation. Hereditary factors also effect this as both parents have different sets of genetics.
Explanation:
This is due to genetic variation. Hereditary factors also effect this as both parents have different sets of genetics.
Answer:
Individuals have two of each chromosome and hence two alleles of each gene, one acquired from each parent. These versions may be identical or may differ from each other.