Telolecithal definitions
| Word backwards | lahticelolet |
|---|---|
| Part of speech | Telolecithal is an adjective. |
| Syllabic division | te-lo-le-ci-thal |
| Plural | telolecithals |
| Total letters | 12 |
| Vogais (4) | e,o,i,a |
| Consonants (4) | t,l,c,h |
Telolecithal is a term used in embryology to describe the distribution of yolk in the egg. In telolecithal eggs, the yolk is concentrated at one end of the egg, while the other end contains the nucleus and cytoplasm.
Fertilization in telolecithal eggs typically occurs at the animal pole, which is the opposite end of the egg where the yolk is located. This is because the animal pole contains the necessary cellular structures for fertilization and early development.
Development Process
During development, the embryo forms at the animal pole and grows towards the vegetal pole, where the yolk is located. As the embryo grows, it must overcome the challenge of incorporating the yolk into its cells to access nutrients for continued development.
Challenges
One of the challenges of telolecithal development is the limitation of resources available to the embryo due to the concentration of yolk at one end of the egg. This can impact the rate and extent of development, as the embryo must efficiently utilize the available nutrients.
Adaptations
Despite these challenges, many species with telolecithal eggs have evolved adaptations to facilitate successful development. For example, certain species may have specialized structures or mechanisms for absorbing and utilizing the yolk during embryonic development.
In conclusion, telolecithal eggs play a significant role in the development of many organisms, presenting unique challenges and opportunities for adaptation in the process of embryogenesis.
Telolecithal Examples
- The telolecithal egg of birds contains a large amount of yolk concentrated at one end.
- Telolecithal eggs have a small amount of yolk distributed evenly throughout the cytoplasm.
- In telolecithal development, the yolk is segregated to one side of the egg during cleavage.
- Telolecithal eggs exhibit meroblastic cleavage due to the presence of a large amount of yolk.
- Telolecithal oocytes have a centrally located nucleus surrounded by a cytoplasmic rim.
- During telolecithal development, the blastoderm forms on top of the yolk in the egg.
- Telolecithal eggs are typically found in avian species such as chickens and ducks.
- The telolecithal nature of the egg influences the pattern of gastrulation in birds.
- Telolecithal embryos undergo epiboly to cover the yolk and complete their development.
- Certain fish species exhibit telolecithal development with a moderate amount of yolk in their eggs.