This essay focuses on weighing and lining up various grades. depicts more of a continuum of our evolution rather than the stepwise pattern depicted
a biology discussion question and need support to help me learn.
Explain how hominin variation depicts more of a continuum of our evolution rather than the stepwise pattern depicted by strict species delineations. Use the Gracile Australopithecus and Early Homo grades to illustrate morphological overlap between “species”. Further explain why the use of morphological grades (see systematics lecture for refresher) is potentially more instructive here than strict species designations (consider the issues with Early Homo).Patients often have their their embryos graded
number followed by two letters (like 4AB). This is called a morphological assessment. This combination of numbers and letters represent how “expanded”. The embryo is, how many cells comprise the inner cell mass .(Which develops into the fetus) and the trophectoderm. (Which develops into the placenta).
weighing and lining up various grades within 3 differing criteria. It is subject to interpretation (for example, is a 3AA better than a 4AB?). However, most studies that have tried to do this come to two conclusions:
As many experts will tell you, grading the inner cell mass and trophectoderm is subjective and some laboratories are tougher graders than others. That makes it hard to generalize how often an “AA,” “AB,” “BA,” “CC” (or what have you) embryo will lead to a live birth. Also, for this reason, it can be helpful to get an image of the embryos in case you want another laboratory’s take on which embryos are most promising.
As we’ve covered before, genetic testing of the embryos can be an effective method to rule out embryos unlikely to lead to a live birth. While there is evidence that