Organisms, which include humans, animals, and plants reproduce as a law of nature, a means of ensuring the survival of the species and in the context of evolution. There are two major classifications of reproduction: sexual and asexual reproduction.
Each has its own advantages and disadvantages. Vertebrates, such as humans, exclusively follow sexual reproduction. Many simpler animals such as amoeba follow asexual reproduction. Read on to explore the meaning and the difference between sexual and asexual reproduction.
Let us have a look at the difference between sexual and asexual reproduction.
Asexual reproduction spans a variety of methods. The simplest single-celled organisms such as archaea, and bacteria, reproduce by binary fission. In this process, the cells simply divide in half creating, a clone of the parent. This method also holds the benefit of being very quick and energy-efficient. For example, bacteria that reproduce by binary fission can give rise to progeny every few hours. Multiple fission also exists in which, an organism splits into more than one offspring. Certain species of algae and protozoans exhibit multiple fission.
While in multicellular organisms, a similar method called fragmentation is observed. In this process, small pieces break off and grow into new organisms. Another method involves budding, which produces a completely new adult by remaining attached to the original body or develops from the original body. A common thread in all this is that the offspring is a direct clone of the parent. The purpose of reproduction, as we’re well aware, is to propagate one’s own genes. Evolutionarily, asexual reproduction is a good bet for the species. It is quick, simple and the genes of the parent will not be diluted by those of another individual. Also, an organism that reproduces asexually can reproduce about twice as fast as one that reproduces sexually.
Sexual reproduction is the combination of reproductive cells from two individuals to form a third unique offspring. Sexual reproduction produces offspring with a different combination of genes.
One must understand that sexual reproduction is a lot more complex than asexual reproduction. It includes the production of gametes, which have half the number of chromosomes of all other cells in the organism and the process of meiosis, which produces haploid cells from diploid cells which could lead to the possibility of two copies of a single chromosome crossing over to create a completely new chromosome that contains a new combination of genes. You see, switching from chromosome to chromosome is a good way to ensure that the genes will keep active in a given population. Besides these, factors like gestation period also play an important role in sexual reproduction. The gestation period is the timeframe it requires for the fetus to fully develop either internally (like the mother’s womb) or externally (like an egg).
Difference between Sexual and Asexual Reproduction
The difference between sexual and asexual reproduction are as follows:
|Asexual Reproduction||Sexual Reproduction|
|Occurs in lower invertebrates, lower chordates, and prokaryotic microorganisms and in some eukaryotic single-celled and multi-celled organisms.||Occurs almost in all types of multicellular organisms including humans, animals, and higher plants.|
|It is uniparental.||It is usually bi-parental.|
|Gametes are not formed.||Gametes are formed.|
|Somatic cells of parents are involved.||Germ cells of parents are involved.|
|No fertilization occurs.||Fertilization takes place.|
|The absence of reproductive organs.||Presence of fully developed reproductive organs.|
|Only mitosis type of cell division occurs.||Both meiosis and mitosis type of cell division occurs.|
|Original parent disappears after the process of reproduction.||Original parents remain alive after the process of reproduction.|
|The progeny and the parent will be genetically identical.||The progenies will be genetically different from the parents.|
|Characteristics of only one parent are inherited.||Characteristics of both parents are inherited.|
|The genes and genetic material are just multiplied and passed on to new organisms from the parent.||The genetic material undergoes intermixing from both parents to form a new set of genetic material.|
|Multiplication is very rapid and takes less time.||Multiplication is not so rapid and takes the longest time to complete.|
|The number of offspring produced may vary from two to many.||The number of offspring produced are comparatively lower.|
|No evolutionary significance.||Has evolutionary significance in the population.|
|Bacterial fission, fragmentation, spore formation, budding of hydra are different types of asexual reproduction.||Syngamy, external fertilization, and conjugation are different types of sexual reproduction.|
Facts about Reproduction
- The record for the longest ever gestation period is held by the elephant which has around 640-660 days as compared to a human’s 280 days.
- The deepsea male anglerfish bites on to the much larger females and then, the tissues start to fuse until the male fish looks like just a lump of tissue dangling from the female’s body. The male anglerfish receives nutrients and the female fish has access to male sperms to fertilize its eggs.
- Oysters are protandric creatures, this means that they can change from male to female over the course of their lifetime.
- Abiogenesis is a process that still remains a mystery. It speculates how the first-ever life arose from nonliving matter such as carbon (Organic compounds.)
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Frequently Asked Questions
How is sexual reproduction different from asexual reproduction?
Sexual reproduction involves the fusion of male and female gametes whereas asexual reproduction does not require male and female individuals and no fusion of gametes takes place.
What are the advantages of asexual reproduction?
Asexual reproduction has the following advantages:
- It requires less energy.
- It can occur in different environments.
- The reproduction process does not require a longer time.
- It requires only a single individual.
What is the advantage of sexual reproduction over asexual reproduction?
Since sexual reproduction requires two individuals, it allows intermingling of genes which is beneficial for the individuals as well as the entire species. The organisms produced by asexual reproduction are genetically identical to each other.
What are the different types of asexual reproduction?
The different types of asexual reproduction include:
- Binary fission
- Vegetative Propagation
What is vegetative propagation?
Vegetative propagation is a form of asexual reproduction that occurs in plants in which a new plant can be grown from any fragment of the parent plant. For eg., vegetative propagation by the stem in ginger, vegetative propagation by leaves in Bryophyllum.