Pros and cons of binary fission
This forms a zygote that will undergo mitosis and form an embryo. This embryo develops into a seed that on germination will develop into a new plant. In some animals, external fertilization takes place. Here the gametes meet outside the body of both parents. In some animals, like reptiles and birds, a hard covering is formed around the zygote. This is called an egg or shell and the zygote develops outside the female body.
Some animals like a kangaroo have a special pouch in the body, for the embryo to grow and develop. In most of the animals, the embryo develops in the female womb. What is Asexual Reproduction?
Asexual reproduction is the process where only one parent is involved giving birth to a progeny. This progeny produced is totally identical to the parent in its genetic makeup. There are organisms that reproduce asexually like bacteria, multicellular organisms like fungi and even plants. Bacteria divides asexually by binary fission. Hydras and yeast reproduce through binary fission.
However, these organisms can undergo sexual reproduction. For example, bacteria can undergo conjugation, hydra and yeast can reproduce sexually. In some invertebrates, parthenogenesis is the process of reproduction. This means, growth of the embryo or seed can take place without fertilization by a male.
This is seen in some parasitic wasps, water fleas, aphids, fish and sharks. Asexual reproduction in plants includes many processes like: Sexual Reproduction Both these processes involve some advantages and disadvantages. The following paragraphs will discuss both the pros and cons of these processes. Advantages of Sexual Reproduction Sexual reproduction involves two organisms of the same species, thus leading to formation of gamete cells.
The gametes fuse together causing mixing and combination of the genetic material. The recombination of genes helps in increasing the chances of the organism evolving into a healthier and more adaptable species. Combination of genes ensures, there is a lesser chance of diseases and defects seen in parents being passed on to their children. Disadvantages of Sexual Reproduction Reproduction cannot occur until and unless gametes from both parents fuse together.
Only half of the population that is, female species are capable of gestation. There is no guarantee that the nucleus of the male gamete will fuse with the female gamete after mating. The time taken to produce an offspring by sexual reproduction is very long. Advantages of Asexual Reproduction One parent is needed to complete the process of asexual reproduction.
In majority of the cases, one is sure an offspring will be produced. The gestation period or growth period is very short. The offspring has the same phenotype and genetic make up as the parent. As there is no cross over or recombination of genes involved, chance of mutation is very less. Disadvantages of Asexual Reproduction As the genetic material from parent is directly passed on to the off spring, it causes all the diseases and defects to be passed on to the offspring as well.
As no recombination of genes occurs, chances of evolution are very low. As you can see both these methods have plenty of differences, but both lead to reproduction of progeny. According to the various species, these methods prove to be a successful way to sustain life.
Asexual Reproduction in Plants. Organisms That Reproduce Asexually. Advantages of Asexual Reproduction. Asexual Reproduction in Animals. What is Vegetative Reproduction. It is a faster and easier form of reproduction.
The energy spent by organisms in finding a partner during sexual reproduction is saved in this mode. The individuals produced as a result of asexual reproduction have the same DNA. It means that the daughter cells produced as a result of asexual reproduction are clones. Cloning would thus prove to be beneficial in such cases. One of the advantages of asexual reproduction is the production of breeding stock. The breeding stock obtained from asexual reproduction is used for the propagation of species in the future.
The process is more or less like cloning. The asexual form of reproduction leads to prolific multiplication of organisms. However, the vigor or genetic diversity required for a species to survive in the long term is found lacking in such organisms. Asexual Reproduction in Plants. Asexual Reproduction in Animals.
What is Vegetative Reproduction. Organisms That Reproduce Asexually. Pros and Cons of Cloning. Organelles and Their Functions. Photosynthesis and Cellular Respiration. List of Human Races. How do Oysters Make Pearls? Rough Endoplasmic Reticulum Function. Mitochondria Structure and Functions. How to Make a Plant Cell Model.