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.
what is ecology
Q. What is Acute Aortic Regurgitation? Infective endocarditis, aortic dissection and trauma often produce severe AR. Acute increase in left ventricular end diastolic volume es
Determination of Erythrocyte Transketolase (ETK) Activity? The enzyme transketolase requires TPP for its activity, for the metabolism of pentose phosphate sugars as described u
How did muir's impression of man's relationship with nature differ from Susan Fenimore coopers? And How did Gifford Pinchot view nature?
Citric Acid Cycle The citric acid cycle, also known as tricarboxylic acid (TCA) cycle, lies at the heart of aerobic metabolism. it is involved in the breakdown of all three maj
Q. Explain Right Atrial Enlargement ? The right atrium (RA) is a globular chamber, forming the right heart border on the PA view. On the PA view, the border of the enlarged RA
classification of coelenterats?
What is karyotype? Name the karyotype is given to the set of chromosomes of an individual, generally when visualized and identified under the microscope. The visualization in g
Economic and ecological importance of protozoans
my homework is asking me to find the four possible gametes for two parents using their genotypes. How do i do that???? would I use the F.O.I.L. method?
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