Reproduction is a characteristic of a living organism. In multicellular organisms, reproduction is the production of which possess features which are similar to those of parents. This is known as sexual reproduction and inv ol ves the fusion of male and female gametes to form a progeny.
Asexual reproduction is also a means of reproduction in some organisms. Fungi spread easily by the production of asexual spores.
In organisms like yeast and hydra budding is the way of reproduction. In flat worms like P lanarians reproduction is by fragmentation.
Unicellular organisms like bacteria and unicellular algae reproduce by increasing the number of cells by cell division. Most of the prokaryotes reproduce asexually without the formation of gametes, while processes like conjugation, transformation and transduction are regarded as sexual reproduction.
Over 11, live tutoring sessions served! To get the best deal on Tutoring, call Toll Free. Home How it works About Us. Biology Cell Asexual Reproduction. Asexual Reproduction Definition Back to Top.
In this type of reproduction, the process of meiosis, reduction of chromosome number and fertilization does not takes place. Gemmules asexual reproduction regeneration
Asexual reproduction is also referred to as agamogenesis. This type of reprod uc tion is the primary form of reproduction for single-celled organisms like archarea, bacteria and protists.
Plant and fungi also show asexual reproduction. Characteristics of Asexual Reproduction Back to Top. Asexual reproduction involves only one parent.
This type of reproduction is seen in lower forms of organisms. It is efficient method as large number of offspring are produced quickly, this enable animals to take advantage of favo rable environmental conditions. Asexual reproduction is sometimes known as cloning. There are many types of asexual reproduction like vegetative propagation, fission, budding and fragmentation. All the forms of sexual reproduction are the variations of process of mitosis.
Types of Asexual Reproduction Back to Top. Fission is a type of asexual reproduction where there is splitting of an individual to form two individuals this is known as binary fission or more may also produce more than two individuals known as multiple fission, all the progeny are approximately of the same size. This is a common form of reproduction Gemmules asexual reproduction regeneration single-celled organisms and bacteria. These organisms divide through binary fission and most of them are capable of sexual reproduction.
Multiple fission occurs in protists like the sporozoans and algae. The cytoplasm is then separated crea ting multi ple daughter c ells. In this mode of asexual reproduction, offspring buds off from the body of the parent cell. The genetic material of the parent cell is divided equally but there is unequal division of the cytoplasm. Hydra reproduces by budding. The buds formed on t
Gemmules asexual reproduction regeneration parent body o f the hydra matures and eventually breaks away from the parent organism.
It is a type of asexual reproduction and is seen in plants where progeny are formed without the Gemmules asexual reproduction regeneration of seeds or spores by the process of meiosis or syngamy. In this type of reproduction plants grow from vegetative parts of the plant like the roots, stems and leaves.
During the biological life of many multicellul a r organisms spores are formed and this process is known as sporogenesis. These spores formed during spo ric meiosis in some plant and algae grow into multicellular in dividu als without the event of fertilization. These haploid spores give rise to gametes through the process of mitosis.
This process of spore formation and gamete formation occurs in separate generations of life cycle and is known as alteration of generation. Fragmentation is a type of asexual reproduction where a new organism grows from "Gemmules asexual reproduction regeneration" fragment of the parent organism. The body of the parent breaks into distinct pieces and these fragments grow into a full and mature individual. This type of asexual reproduction is seen in many organisms like annelid Gemmules asexual reproduction regeneration, sea stars, and some fungi and plants.
T his form of asexual reproduction is seen in sponges where a parent organism releases a specialized mass of cells that develops into offspring. Agamogenesis is a typ e of reproduction in which the reproduction does not involve a male gamete.
Types of agamogenesis are parthenogenesis and apomixis.
Parthenogenesis is a form of reproduction in which a egg that is unfertilized develops into a new individual. This type of agamogenesis occurs naturally in many plants and invertebrates like water feas, aphids, stick insects, etc.
Apomixis is the formation of new sporophyte without the process of fertilization. It is usually seen in ferns and flowering plants and is a rare process in seed plants. Advantages of Asexual Reproduction Back to Top. This type of reproduction enable organisms to reproduce without a mate.
It does not require the time and energy that takes to search a mate. It results in the reproduction of large number of offspring rapidly. Like in plants, it enables to spread and colonize an area in short period of time. Animals that are confined to one particular place and unable to look for a mate reproduce asexually.
Stable environments with very little change are favorable for organisms to reproduce asexually. Disadvantages of Sexual Reproduction Back to Top.
In this type of reproduction the offspring produced are gene t ically identical to each other and to the parent. This causes no or very little genetic variation within a population. If there is harmful mutation in the organisms, environment changes could be deadly to all the individuals.
Asexual Reproduction in Animals Back to Top. Asexual reproduction is less common in animals. It is often seen in simpler animals like hydra. Animals reproduce asexually by many different methods. The methods are budding, parthenogenesis, gemmule formation and Budding is the process where the parent cell buds off forming daughter organisms. In parthenogenesis eggs are produced by the females Gemmules asexual reproduction regeneration into adult organisms without undergoing the process of fert ilization.
Gemmules are internal buds, gemmules are
Gemmules asexual reproduction regeneration masses that are released from their body and these cells develop into independent offspring. Polyembryony is a condition in which a single egg leads to the development of two or more embryos. Asexual Reproduction in Plants Back to Top.