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Asexual reproduction introduction


Asexual reproduction occurs when an organism makes more of itself Asexual reproduction introduction exchanging genetic information with another organism through sex. In sexually reproducing organisms, the genomes of two parents are combined to create offspring with unique genetic profiles. This is beneficial to the population because genetically diverse populations have a higher chance of withstanding Asexual reproduction introduction challenges such as disease and environmental changes.

Asexually reproducing organisms can suffer a dangerous lack of diversity — but they can also reproduce faster than sexually reproducing organisms, and a single individual can found a new population without the need for a mate. Some organisms that practice asexual reproduction can exchange genetic information to promote diversity using forms of horizontal gene transfer such as bacteria who use plasmids Asexual Asexual reproduction introduction introduction pass around small bits of DNA.

However this method results in fewer unique genotypes than sexual reproduction. Some species of plants, animals, and fungi are capable of both sexual and asexual reproduction, depending on the demands of the environment.

Asexual reproduction is practiced by most single-celled organisms including bacteria, archaebacteriaand protists. It is also practiced by some plants, animals, and fungi. This is especially useful for Asexual reproduction introduction whose survival strategy is to reproduce very fast. Many species of bacteria, for example, can completely rebuild a population from just a single mutant individual Asexual reproduction introduction a matter of days if most members are wiped out by a virus.

This Asexual reproduction introduction useful for species whose members may find themselves isolated, such as fungi that grow from wind-blown spores, plants that rely on pollinators for sexual reproduction, and animals inhabiting environments with low population density. Asexual reproduction, which can often be accomplished just Asexual reproduction introduction having part of the parent organism split off and take Asexual reproduction introduction a Asexual reproduction introduction of its own, takes fewer resources than nurturing a new baby organism.

Many Asexual reproduction introduction and sea creatures, for example, can simply cut a part of themselves off from the parent organism Asexual reproduction introduction have that part survive on its own. Only offspring that Asexual reproduction introduction genetically identical to the parent can be produced in this way: This ability to simply split in two is one reason why asexual reproduction is faster than sexual reproduction.

The biggest disadvantage of asexual reproduction is lack of diversity. Because members of an asexually reproducing population are genetically identical except for rare Asexual reproduction introduction, they are all susceptible to the same diseases, nutrition deficits, and other types of environmental hardships.

The Irish Potato Famine was one example of the down side of asexual reproduction: As a result, almost all crops failed, and many people starved. The near-extinction of the Gros-Michel banana is another example — one of two major cultivars of bananas, it became impossible to grow commercially in the 20th century Asexual reproduction introduction the emergence of a disease to which it was genetically vulnerable.

On the other hand, many species of bacteria actually take advantage of their high mutation rate to Asexual reproduction introduction some genetic diversity while using asexual reproduction to Asexual reproduction introduction their colonies very rapidly. Bacteria have a higher rate of Asexual reproduction introduction in Asexual reproduction introduction genetic sequences, which sometimes leads to the creation of useful new traits even in the absence of sexual reproduction.

Some organisms split off a small part of themselves to grow into a new organism. This is practiced by many plants and sea creatures, and some single-celled eukaryotes such as yeast. Much like budding, this process involves a plant growing a new shoot which is capable of becoming a whole new organism. Sporogenesis is Asexual reproduction introduction production of reproductive cells, called spores, Asexual reproduction introduction can grow into a Asexual reproduction introduction organism.

Spores often use Asexual reproduction introduction strategies to those of seeds. But unlike seeds, Asexual reproduction introduction can Asexual reproduction introduction created without fertilization by a sexual partner. Spores are also more likely to spread autonomously, such as via wind, than to rely on other organisms such as animal carriers to spread.

This process resembles budding and vegetative propagation, Asexual reproduction introduction with some differences. Earthworms and many plants and sea creatures are capable of Asexual reproduction introduction whole organisms from fragments following injuries that split them into multiple pieces.

When Asexual reproduction introduction does occur voluntarily, the same parent organism may split into many roughly equal parts in order to form Asexual reproduction introduction offspring. This is different from the processes Asexual reproduction introduction budding and vegetative propagation, where an organism grows new parts which are small compared to the parent and which are intended to become offspring organisms. Agamenogenesis is the reproduction of normally sexual organisms without the need for fertilization.

There are several ways in which this Asexual reproduction introduction happen. In parthenogenesis, an unfertilized egg begins to develop into a new organism, which by necessity possesses only genes from its mother. This occurs in a few species of all-female animals, and in females of some animal species when Asexual reproduction introduction are no males present to fertilize eggs.

In apomoxis, a normally sexually reproducing plant reproduces asexually, producing offspring that are identical to the parent plant, due to lack of availability of a Asexual reproduction introduction plant to fertilize female Asexual reproduction introduction. This is primarily known to occur in citrus fruit, which may produce seeds in this way in the absence of male fertilization. Because they have only one cell, bacteria are able to change their genetic material as mature organisms.

Bacteria can afford to use this survival strategy because their extremely rapid reproduction makes harmful genetic mutations — such as copying errors or horizontal gene transfer gone wrong — inconsequential to the whole population.

As long as a few individuals survive mutation and calamity, those individuals will be able to rebuild the bacterial population quickly. This strategy would not work well for an organism that invests highly in the survival of individuals, such as multicellular organisms.

Slime molds are a fascinating organism that sometimes behave like Asexual reproduction introduction multicellular organism, and sometimes Asexual reproduction introduction like a colony of single-celled organisms.

Unlike animals, plants, and fungi, the cells in a slime mold are not bound together in a fixed shape and dependent on each other for survival.

Asexual reproduction is a type...

The cells that make up Asexual reproduction introduction slime mold are capable of living individually and Asexual reproduction introduction spread or separate when food is abundant, much like individuals in a colony of bacteria.

Slime Asexual reproduction introduction whose cells are working cooperatively can be mistaken for fungi, and can perform locomotion. Slime Asexual reproduction introduction can produce spores much like a fungus, and they can also reproduce through fragmentation. This species of lizard was created by the Asexual reproduction introduction of two neighboring species. Genetic incompatibility between the hybrid parents made it impossible for healthy males to be born: All New Mexico whiptail lizards are female.

Reproduction can be classified into...

New members of the Asexual reproduction introduction can be created through hybridization of the parent species, or through parthenogenesis by female New Mexico whiptails. It is thought that the mating behavior Asexual reproduction introduction ovulation, which can then result in a parthenogenic pregnancy. Which of the following is NOT an advantage of asexual reproduction? No need for a mate. Low resource investment in offspring.

Answer to Question 1 B is correct.

Many plants reproduce asexually as...

High genetic diversity is a Asexual reproduction introduction of sexual reproduction, whereas low genetic diversity is a characteristic of asexual reproduction. Which Asexual reproduction introduction the Asexual reproduction introduction events was NOT caused by low genetic diversity due to asexual reproduction?

The Irish Potato Famine B. The disappearance of the Gros-Michel banana C. The Black Death in England D. A and B Answer to Question 2 C is correct. Europeans survived the Black Death in England, perhaps in part because of genetic diversity due to sexual reproduction. The Gros-Michel banana was not so lucky when it was hit by Panama Disease, and almost all Asexual reproduction introduction reproduction introduction of Asexual reproduction introduction plant, which were genetically identical due to asexual reproduction, were killed.

The same problem of asexual reproduction resulted in the deaths of most potato crops due to fungal infection, and subsequently in mass starvation, in the Asexual reproduction introduction Potato Famine. Which of the following is NOT true of asexual reproduction? Some organisms can only perform asexual reproduction because their genetics does not allow for the existence of healthy males. Some organisms can perform both sexual and asexual reproduction. It is used by a variety of organisms, including all bacteria and some plants, animals,and Asexual reproduction introduction. It is used only by single-celled organisms.

Answer to Question 3 D is correct. Asexual reproduction is the only means of reproduction for prokaryotes, but some eukaryotes, including many plants, many sea creatures, and some land animals are also capable of reproducing asexually. Asexual Reproduction Definition Asexual reproduction occurs when an organism makes more Asexual reproduction introduction itself without exchanging genetic information with another organism through sex.

Evolution and animal life. Answer to Question 1. Answer to Question 2. Answer to Question 3.

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