What is meant by the term “activation” in embryology?

Distinguish between genetic and epigenetic influences on development.

a) If fetal glucose consumption declines, how does the glucose concentration gradient between fetal circulation and the intervillous space change?  b) When fetal glucose consumption declines, how is the concentration gradient between parental circulation and the intervillous space impacted?  c) When fetal glucose consumption declines, placental tissue adjusts its consumption of glucose to maintain a constant concentration gradient between the fetal circulation and the intervillous space. In order to maintain this gradient, would you expect placental tissue to increase or decrease its glucose consumption, and why is this the case?

How can matter alone construct itself into the organized tissues of the embryo?

Identify Genes Required for Specific Developmental Processes

Embryonic stem cells used for research most commonly come from: A) an embryo created in a fertility clinic and legally released for scientific research B) an embryo that is approximately four to six days past fertilization C) the embryoblast layer of an embryo in the blastocyst stage D) all of the above

You have an embryo in the eight-cell stage that shows radial and indeterminate cleavage. What would happen if you separated the cells of this embryo and placed them each into tissue culture media? Each cell may continue development, but only into a nonviable embryo that lacks many parts. Each cell may develop into a full-sized, normal embryo. All eight cells would die immediately. Each cell may deyelop into a smaller-than-average, but otherwise normal, embryo.