aFinal answer:
Genetic variation, facilitated by the recombination of genes during gamete formation, is crucial for species survival as it allows offspring to adapt to environmental changes. Mutation and sexual reproduction are key sources of genetic diversity, with the latter providing a combination of genetic material for adaptation through natural selection.
Step-by-step explanation:
Genetic variation is vital to the long-term survival of a species and can be caused by the recombination of genes during gamete formation. Genetic variation results from the new combinations of genes that enable offspring to better adapt to environmental changes. Populations of species share a gene pool, which includes all the gene variants within the species, and changes within this gene pool must be genetic in order to be passed on and result in evolution.
There are two primary ways in which genetic variation can occur within a species: through mutations and sexual reproduction. Mutations are permanent changes in DNA sequences that create new genetic variation. During sexual reproduction, however, the recombination of genes during the formation of gametes (sperm and egg cells) ensures that each offspring has a unique set of genetic traits. This recombination is a critical element of genetic diversity, providing the raw material for evolution through natural selection.
In sexually reproducing organisms, genetic changes must occur in the gametes to be passed on to the next generation. Genetic variability allows for some individuals to be better adapted to changes, and therefore more likely to survive, reproduce, and pass on their genes. Reproduction is therefore essential for genetic change to establish itself in a population or species.