viviparity वाक्य
उदाहरण वाक्य
मोबाइल
- It has been suggested that birds are phylogenetically constrained, as being derived from reptiles, and likely have not overcome this constraint or diverged far enough away to develop viviparity.
- Traditionally this variety was classified into three modes, oviparity ( embryos in eggs ), viviparity ( young born live ), and ovoviviparity ( intermediate between the first two ).
- Like other stingrays, the estuary stingray exhibits aplacental viviparity, with the developing embryos sustained initially by yolk and later by histotroph ( " uterine milk " ) produced by the mother.
- Recent research into physiological, morphological and genetic changes associated with fish reproduction provide evidence that incubation in some species is a highly specialized form of reproduction similar to other forms of viviparity.
- The absence of genomic imprinting in a placental reptile, the southern grass skink, is interesting as genomic imprinting was thought to be associated with the evolution of viviparity and placental nutrient transport.
- Unless they find a relatively benign ecology somewhere where they might slowly lose the necessity for land incubation and thick-shelled eggs, they can't really make the leap to viviparity.
- Despite strong similarities between viviparity in mammals, researchers have historically been reluctant to use the term " pregnancy " for non-mammals because of the highly developed form of viviparity in eutherians.
- Despite strong similarities between viviparity in mammals, researchers have historically been reluctant to use the term " pregnancy " for non-mammals because of the highly developed form of viviparity in eutherians.
- The earliest documented case of viviparity in reptiles is the Early Permian mesosaurs, although some individuals or taxa in that clade may also have been oviparous because a putative isolated egg has also been found.
- Variations on the theme in biology are enormous, ranging from trophic eggs to squamate reptiles in particular, there is a correlation between high altitudes or latitudes, colder climates and the frequency of viviparity.
- The spadenose shark has the most advanced form of placental viviparity known in fish, as measured by the complexity of the placental connection and the difference in weight between the egg and the newborn young.
- The tsetse fly ( as well as other Glossinidae, Hippoboscidae, Nycteribidae and Streblidae ) exhibits adenotrophic viviparity; a single fertilised egg is retained in the oviduct and the developing larva feeds on glandular secretions.
- Thierry Lod?described reproductive strategies in terms of the development of the zygote and the interrelationship with the parents; there are five classifications-ovuliparity, oviparity, ovo-viviparity, histotrophic viviparity and hemotrophic viviparity.
- Thierry Lod?described reproductive strategies in terms of the development of the zygote and the interrelationship with the parents; there are five classifications-ovuliparity, oviparity, ovo-viviparity, histotrophic viviparity and hemotrophic viviparity.
- Thierry Lod?described reproductive strategies in terms of the development of the zygote and the interrelationship with the parents; there are five classifications-ovuliparity, oviparity, ovo-viviparity, histotrophic viviparity and hemotrophic viviparity.
- The " Incisoscutum " fossils show the oldest record of viviparity in any vertebrate, therefore internal fertilization and viviparity must have evolved in the vertebrates at least 380 million years ago and outside the gnathostomes.
- The " Incisoscutum " fossils show the oldest record of viviparity in any vertebrate, therefore internal fertilization and viviparity must have evolved in the vertebrates at least 380 million years ago and outside the gnathostomes.
- Like the false catshark, the slender smooth-hound exhibits aplacental viviparity with oophagy, in a form different from that in the fertilized and develops into an embryo, while the remaining ova begin to break down.
- In zoology " viviparity " refers to development of the embryo inside the body of the parent, eventually leading to live birth, as opposed to reproduction by laying eggs that complete their incubation outside the parental body.
- The idea that the tendency to favour egg-retention selectively under cooler conditions arises from the thermoregulatory benefits, and that it consequently promotes the evolution of viviparity as an adaptation, is known as " the cold climate hypothesis ".
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