Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Cell Determination
Cell determination is a process through which portions of embryonic genome are selected for expression in particular embryonic cells. Determination to follow a specific pathway of differentiation precedes the appearance of any type of visible change in biochemistry or morphology of the cell. We know of two major ways through which determination takes place. in one way certain factors that reside in the cytoplasm of embryonic cells (intrinsic factors) control cell determination. These factors are considered to as ooplasmic or cytoplasmic determinants. During cleavage they are passed on to particular blastomeres whose future differentiation is so finally decided. This process is also called determination by cytoplasmic segregation.
In the other method, the final cell fate is determined through extrinsic factors that originate outside the cells. The extrinsic factors include:
1) The instructions acquired as a function of the position of blastomeres within the embryo,
2) Signals that are transmitted among the blastomeres.
This second process is termed as embryonic induction in which the cell fate is determined by signals received from different cells. In different species determination takes place at different times during development. It may be very early or it may take place at relatively much later stages. In quite a number of animal groups, like annelids, molluscs, tunicates etc. the fates of the blastomeres resultant from the first few cleavage divisions are already determined. Such types of eggs and embryos are called determinate or mosaic. In others such as echinoderms and vertebrates final determination takes place much later, even as late as during or after gastrulation, and they are said to have indeterminate or regulative eggs.
Define Precautions for Determination of Haemoglobin Content in Blood 1. Potassium cyanide is highly toxic and hence drabkin's solution should not be pippeted by mouth. 2. Dr
in the oneward form
Titration of inverted honey solution It involves the titration of the inverted honey solution. Carry out the titration in the following manner. 1) In a conical flask take 5
Nursing Interventions of a Patient with Acute Alcohol: Intoxication and Withdrawal Some nurses find it very difficult to work with the alcoholics. This is particularly true w
Difference between Vegetative and Generative Cell The cytoplasm of the vegetative cell and the generative cell is distinctly different. The generative cell is transparent and
Relation between taxonomy and ecology
Energy Budget - Ecosystem All living things must take in and use energy to maintain their bodies, to grow, to obtain more energy and to reproduce. Each individual has an 'ener
1. Given a log phase bacterial culture with 1 x 106 cells per ml and a generation time of 20 minutes, how long does it take the culture to reach a density of 6.4 ? 107 cells per ml
Causes of Apomixis Apomictic species are generally hybrids or polyploids, as a consequence, there is irregular meiosis. Apomixis appears to be controlled by a set of genes. T
RECORDS AND REPORTS: The principles of administration are described as 'POSDCORB'. The 'R' stands for recording and reporting. Recording and reporting is related to all oth
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +1-415-670-9521
Phone: +1-415-670-9521
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd