external fertilization वाक्य
उदाहरण वाक्य
मोबाइल
- Animals which live in the water can mate using external fertilization, where the eggs and sperm are released into and combine within the surrounding water.
- On the other hand, he suggested that since external fertilization occurs when the female deposits her eggs, the male has a much greater paternity confidence.
- Although paternal care is normal in teleost fishes with external fertilization, it is the mothers in this species that guard and care for eggs until they hatch.
- Many animals that live in water use external fertilization, whereas internal fertilization may have developed from a need to maintain gametes in a liquid medium in the Late Ordovician epoch.
- Banded killifish are commonly observed to spawn in dense aquatic vegetation because they practice external fertilization where the female lays her eggs that are equipped with adhesive threads that adhere to plants.
- The relationship with other molluscs, however, is apparent from some features of the digestive system; aplacophorans possess both a radula and a hermaphroditic, but caudofoveates have two sexes, and reproduce by external fertilization.
- About 14 % use a similar external fertilization but produce yolk-rich eggs, which reduce the time the larva needs to spend among the plankton, or eggs from which miniature adults emerge rather than larvae.
- The "'Tanganyika killifish "'( " Lamprichthys tanganicanus " ) is a species of poeciliid SL . It is an egglayer with external fertilization, and deposits its eggs in narrow crevices.
- Internal fertilization with many vertebrates ( such as reptiles, some fish, and most birds ) occur via cloacal copulation ( see also hemipenis ), while mammals copulate vaginally, and many basal vertebrates reproduce sexually with external fertilization.
- Where as most Ctenophores are hermaphroditic, certain platyctenids have been found to be asexual, and furthermore, where other Ctenophores have been found to reproduce using external fertilization, certain species of platyctenids have been found to use brood pouches.
- They use external fertilization, and are mostly hermaphroditic, although some are male or protogynous ( female and then male ) . " Z . sociatus " was found to reproduce seasonally in Panama, and synchronizes the release of gametes with extremely low tides.
- In species with external fertilization and male parental care, females are able to distribute her clutch amongst different males and by doing so the female increases the likelihood that at least some of her offspring will receive indirect genetic benefits and / or extensive parental care from a quality provider.
- Both gamete competition and gamete limitation assume that anisogamy originated through disruptive selection acting on an ancestral isogamous population with external fertilization, due to a trade-off between larger gamete number and gamete size ( which in turn affects zygote survival ), because the total resource one individual can invest in reproduction is assumed to be fixed.
- Dawkins and Carlisle further expanded on this by suggesting that uniparental female care is dominant during internal fertilization because the male has time to desert, and uniparental male care is dominant during external fertilization because the male first waits for the female to deposit the eggs and only then does he fertilize them with his sperm, which gives the female time to escape.
- Since the discovery of sperm attraction to the female gametes in ferns over a century ago, sperm guidance in the form of sperm chemotaxis has been established in a large variety of species Although sperm chemotaxis is prevalent throughout the Metazoa kingdom, from marine species with external fertilization such as sea urchins and corals, to humans, much of the current information on sperm chemotaxis is derived from studies of marine invertebrates, primarily sea urchin and starfish.
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