There are several different types of asexual reproduction. These include budding, where the offspring grows out of the body of the parent, and gemmules, where the parent releases a specialized mass of cells that will become a new individual.
There are two types of sexual reproduction. Syngamy is the permanent fusion of two haploid gametes to create a zygote. In humans, this is called fertilization. Conjugation, on the other hand, is temporary fusion using a cytoplasmic bridge. This is particularly seen in bacteria, which pass DNA across the bridge.
Asexual reproduction is reproduction that occurs without any interaction between two different members of a species. Cells divide using mitosis, in which each chromosome is copied before the nucleus divides, with each new cell receiving identical genetic information.
Sexual reproduction is reproduction that requires a male and a female of the same species to contribute genetic material. Special cells called gametes are produced through meiosis, which halves the number of chromosomes in each resulting cell. These cells are called haploid gametes. Fertilization occurs when two gametes – one from a male and one from a female – combine, producing a diploid zygote with its own individual genetic makeup.
Asexual reproduction is used by many plants, e.g. spider plants, bacteria, hydra, yeast, and jellyfish. It is also involved in the creation of identical twins, when one zygote splits into two identical copies.
Sexual reproduction is used by most mammals, fish, reptiles, birds and insects.
Advantages and Disadvantages
Asexual reproduction is well suited for organisms that remain in one place and are unable to look for mates, in environments that are stable. It is usually used by simple organisms such as bacteria. However, asexual reproduction does not lead to variation between organisms, meaning that entire groups can be wiped out by disease, or if the stable environment changes.
Sexual reproduction allows for variation, the most fundamental element of evolution. It therefore creates species that can adapt to new environments and that cannot be wiped out by a single disease. However, sexual reproduction requires significant energy on the part of the organism to find a mate. It is not well suited to organisms that are isolated or stuck in place.
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"Asexual vs Sexual Reproduction." Diffen.com. Diffen LLC, n.d. Web. 28 Jan 2020. < >
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