If the whole ectoderm is exposed to high levels of BMP activity, which of the following ectodermal derivatives will not probably form? (Check all that apply)   Nails   Cornea   Facial cartilage   Lens   Brain   Hair   Dentine of the tooth   Neural pituitary   Adrenal medulla   Retina

Choose all of the correct statements about the formation and role of somites during development. Somites are formed when the notochord signals adjacent mesoderm cells Somites are ectoderm cells, so they will form teeth, jaws, and skin Somites signal adjacent cells to form ossification centers, which eventually grow bone to form vertebrae and ribs O Somites will directly turn into the neural tube (spinal cord)

Background: The slow block to polyspermy involves a permanent modification of the egg surface, usually through exocytosis of the cortical granules. In the 1970s, Dave Epel carried out experiments that led to the conclusion that a Ca2+ rise in the egg is both necessary and sufficient to trigger cortical granule exoctyosis (CGE).       Experiment (c) – Dr. Epel injects a calcium chelator (called EGTA; chelators act as specific “sinks” or “magnets” for ions) into unfertilized eggs and then adds sperm. The sperm bind and fuse with the eggs, but no CGE occurs.   For the experiment above, describe it as correlation, loss-of-function or gain-of function. Then, indicate the predicted result.

Which of the following is an illustration of permissive interaction?   -When implanted in the newt embryo, the frog oral ectoderm can only differentiate into frog derivatives and will not differentiate into newt derivatives.   -Contact with the appropriate extracellular matrix is sufficient for cells to express differentiation-specific genes.   -An inducing signal from the optic vesicle is necessary for new gene expression in the lens ectoderm.   The epidermis signals the underlying dermis to create condensations and the dermal condensations then signal the epidermis to form specific cutaneous structures.   Wing epidermal epithelium produces wing feather when exposed to wing dermal mesenchyme, but will produce scales and claw when exposed to foot dermal mesenchyme.

As Cleavage stage of embryo genesis proceeds, the developmental potential of the cells becomes restricted.     True     False

What happens in the 3rd- 8th stage of embryonic stage of prenatal development? A major milestone for a 2-3year is? Stress reduction for the missel age adult to help prepare them for retirement could be?

Which of the following is NOT true about the specification of the eye field? (Check all that apply)   During early gastrulation, Noggin promotes the expression of both ET and Otx2.   ET induces RX, which in turn blocks Otx2 and Pax6.   ET induces RX, which in turn induces Pax6 and blocks Otx2 within the eye field.   It starts with neural induction when the neural plate is induced within the ectoderm.   During late gastrulation, Otx2 blocks the inhibition of ET by Noggin.   ET induces RX, which in turn induces Otx2 and Pax6.   Pax6 is only required for the specification of the retina.   Pax6 initiates the expression of a network of transcription factors, some of which mutually activate one another.   During late gastrulation, the forebrain and hindbrain are specified.   During early gastrulation, Noggin indices Otx2 but blocks E

Folic acid is a fundamental element required in the diet of pregnant women. Why? Describe the developmental pathway where folic acid is crucial factor and the expected cellular responses. Why Is it imperative for a woman to take folic acid if she is planning to become pregnant?  Manufacturers of maternal care products are aware of the importance of folic acid in pregnancy. Upload an image of an example of such product and highlight folic acid among the ingredients.

The slow block to polyspermy involves a permanent modification of the egg surface, usually through exocytosis of the cortical granules. In the 1970s, Dave Epel carried out experiments that led to the conclusion that a Ca2+ rise in the egg is both necessary and sufficient to trigger cortical granule exoctyosis (CGE). For the experiment below, describe it as correlation, loss-of-function or gain-of function. Then, indicate the predicted result.   Experiment (a) – Dr. Epel injects the egg with an indicator dye that fluoresces when Ca2+ binds to it. In unfertilized eggs, there is no fluorescence and no CGE. However, when sperm are added to the eggs, he observes fluorescence and then CGE.

The pituitary hormone that stimulates milk production by the mammary glands is prolactin. 00000 growth hormone. FSH. TSH. ACTH.