The process of duplication from pre-existing genes is called

Gene duplication

Explanation:

Gene duplication is defined as a process by which new genetic materials are produced during the course of molecular evolution. It refers to the replication of a portion of DNA that is comprised of a gene. This process is sometimes essential to the organism and may also result in the development of a new type of species. They also considered the chromosomal duplication process. For example, the different types of keratin that are found in the body are due to the replication of a single gene.

an organism's phenotype is the  form of a trait  that it  displays. for  flowercolor, a pea  plant  can  display  a phenotype of purple or white flowers. an organism's  genotype  is the alleles of a gene it contains. based on his data, mendel concluded that a phenotype can be  determined  by more than one  genotype.

name and explain one of the event that occurs during meiosis that increases the variation in offspring even more than simple reproduction?