Advantages of Sexual Reproduction

    There are both sexual and asexual forms of reproduction. Asexual reproduction is actually more straightforward and energy-efficient, while sexual is much more complex and energy-demanding. However, despite the apparent efficiency of asexual reproduction, sexual reproduction remains the most dominant and widely used. This is due to several evolutionary advantages that help a species adapt to changing environments. 

    The Red Queen Hypothesis states that a species must constantly evolve and adapt to survive in the biological arms race. With sexual reproduction there is shuffling of genetic materials, leading to offspring with a combination of traits and the chance of mutations leading to more advantageous ones. On the other hand, asexual reproduction leads to genetically identical offspring. While this is okay in stable environments, it leaves the population vulnerable to new threats and changes in their environment. Namely, pathogens and parasites can quickly evolve to exploit the weakness of their host species. The genetic diversity in sexually reproducing species makes it more difficult for a parasite to adapt to the hosts' genotypes. 

    As seen in the example below, with the genetic variation that is provided with sexual selection, the birds have a variety of beak types, allowing them to eat different seeds, fruits, or other available foods. However, without genetic variation, they all have the same size beak, so if there was a change in the available food within their environment, such as a loss of small seeds, there would be no advantageous traits for natural selection to select for. 

    Heterozygosity is when there are two different alleles at a specific location or locus in the genome. This arises from sexual reproduction and the mixing of parental genomes. Having a high heterozygosity increases the chance of an organism to survive against environmental changes and parasites. Asexual reproduction limits this genetic variation, leading to low heterozygosity and a vulnerability to change. 

    When it comes to long-term survival, sexual reproduction is the best chance a species has, despite its high energy costs and complexity. This complements what I have learned in both this class and previous ones. While the energy and time cost to find a mate are high, the advantages that it provides outweigh the costs. A species that can only make identical genetic copies of itself is at insanely high risk. A diverse gene pool increases the likelihood that a population will survive in this ever-changing world.