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Short Answer:
Asexual animals are rare, but they exist. Most, but not all have a sexual reproduction phase.
The exceptions are discussed below and in related links.
Longer Answer:
The term for asexual reproduction is parthenogenesis. Asexual reproduction in plants, fungi, molds and bacteria is commonplace. This answer deals animals and includes fish and insects and reptiles.
A number of species can produce both sexually and asexually. This has been observed in some species of aphids, Daphnia, rotifers, nematodes. Some invertebrates, and . Apparently other Among vertebrates, certain lizards have this ability including Komodo dragons. Asexual reproduction is documented in two shark species, hammerhead- and blacktop.
If one considers cloning a form of asexual reproduction, i.e. making identical copies of an original that was the result of combining male and female genetic materials, then a number of higher animals do this in the womb with the 9-banded armadillos being the most studied example. (Twins in humans and other animals are considered an accident version of this and not true asexual reproduction, but that is a matter of opinion.) Several insects (Hymenoptera) have this ability.
The rarest form of animal asexual reproduction is obligate parthenogenesis where the species propagates with only an asexual mechanism.
There are over 80 species reptiles, amphibians and fishes which no longer involve males in the reproductive process. Bdelloid rotifers have evolved in this manner as well as two species of stick insects.
What else can I help you with?
Why does the phase of the moon effect animals?
Animal research claims the lunar cycle may affect hormonal changes in insects. The lunar cycle influences reproduction in fish. The moon phases supposedly effect reproduction and menstruation in humans as well.
Why does human hair grow longer than animal hair and keep growing?
AnswerShort answer- noone knows exactly what selective advantage long scalp hair has. Most common theories are that it has something to do with sexual selection. This is the answer biologists tend to give when a feature has no obvious useful function. Difference is that human hair has a longer growth period (about 2-6 years) than the hair (fur) of most non-human animals. But again, noone really knows why. Answer An important aspect to keep in mind is that "animal hair" is indeed growing all the time, but it also falls off. Thus an equilibrium is reached where the hair in animal fur stays, on average, at a "constant" length. The same would happen with the hair that remains at a constant length in humans (like hair of the arms).
Does the phase of the moon affect chicken egg production?
The phase of the moon affects ocean tides and barometric pressure. It is logical that it would affect egg production.
What is the Difference between estrous and estrus?
The estrous cycle is the cycle of a non-pregnant female mammal that goes through a luteal phase and a follicular phase. Estrus is the period in which an animal will stand to be bred, and is part of the follicular phase of the estrous cycle. An easy way to remember it is that estrous is an adjective and estrus is a noun. Thus, estrous refers to the entire cycle, whereas estrus just refers to the phase in which the animal can get pregnant. Usage: The female chimpanzee can get pregnant because she is in estrus. The female chimpanzee can get pregnant in this phase of her estrous cycle.
Does DNA replicate in mitosis?
no DNA replicates before mitosis. It replicates in the S phase of inter phase
What is the type of fungi in which a sexual phase has not been observed?
Deuteromycetes is the informal name given to fungi in which a sexual phase has not been observed. These fungi are characterized by their asexual reproduction methods and lack of a known sexual reproductive stage.
The third stage of the sexual response cycle is the phase?
The third stage of the sexual response cycle is the orgasm phase. During this phase, there is a climax of sexual tension, with intense physical pleasure and release of sexual tension. This is followed by the resolution phase.
What phase of the sexual response can last the longest?
The plateau phase of the sexual response cycle can potentially last the longest. This phase occurs after arousal and is characterized by sustained levels of arousal before reaching climax. The duration of this phase can vary greatly among individuals.
What are the 5 kingdoms characteristics?
Plants are 1) Eukaryotic, 2) Photosynthetic, 3) Multicellular, 4) Sexually reproducing, and 5) their Life History involves an alternation of a haploid phase (Gametophyte) with a diploid phase (Sporophyte)
Are jelly fish sexual or asexual?
Stingrays are sexual, they mate during their matting season
What is the second phase of masters and johnson's sexual response cycle?
The second phase of Masters and Johnson's sexual response cycle is the plateau phase. This phase involves a continuation of the physiological changes that occurred during the excitement phase, leading to increased pleasure and arousal. It is characterized by further increases in heart rate, breathing, and muscle tension.
The gametophyte or sexual phase in a moss life cycle begins with?
The gametophyte or sexual phase in a moss life cycle begins with the germination of spores. These spores develop into a structure called a protonema, which then gives rise to the mature gametophyte plant. This mature gametophyte produces gametes (eggs and sperm) for sexual reproduction.
What is a gametophype?
Gametophyte, in plants and certain algae, the sexual phase (or an individual representing the phase) in the alternation of generations—a phenomenon in which two distinct phases occur in the life history of the organism, each phase producing the other. The nonsexual phase is the sporophyte.
What is the Prolonged plateau phase?
The prolonged plateau phase is a stage in the sexual response cycle where arousal is maintained at a high level for an extended period without reaching climax. It can occur in both males and females and may result in increased sexual tension and sensitivity.
How do you know if being gay isn't just a phase?
There's actually no such thing as a gay phase. This is an outdated concept. There is a phase where some teens might worry about their sexual orientation, but that's a different issue.
Explain the first and second phase of sexual activity?
The first phase of sexual activity is the arousal phase, characterized by increased blood flow to the genitals, muscle tension, and increased heart rate. The second phase is the plateau phase, where arousal continues to build and can lead to increased sensitivity and tension in the body.
What is the resting spore during the sexual phase of the mold's life cycle called?
Well referring to my Biology text book, " A Zygospore ( ZY-goh-spawr ) is a resting spore that contains zygotes formed during the sexual phase of the mold's life cycle."
