Question

What is the usage of a pre-existing gene to function in development of a novel characteristic that was not its original purpose?

A. homeobox genes
B. re-purposing, co-opting, or exaptation
C. in situ hybridization
D. colinearity
E. deep homology

Answer 1

Exaptation is the process by which pre-existing genes take on new functions that were not their original purpose. Homeobox genes control development during the embryonic stage by regulating the activities of other genes through transcription factors. They play a role in the evolution of novel characteristics by utilizing pre-existing genes for new functions.

Step-by-step explanation:

Exaptation occurs when a pre-existing gene takes on a new function that was not its original purpose. This can happen through various mechanisms such as gene expression, alternative splicing, or gene duplication. For example, a gene that originally provided a selective advantage in protecting against solar radiation may later be repurposed for mating behavior. Homeobox genes are a group of genes that regulate development during the embryonic stage by controlling the activities of other genes through transcription factors. These genes play a role in the evolution of novel characteristics by utilizing pre-existing genes for new functions.