You decide to develop the MNStar, a new aquatic invertebrate…

You decide to develop the MNStar, a new aquatic invertebrate isolated from the pond beneath the Spoon and Cherry sculpture into a new aquatic model organism.  All sea urchin techniques discussed in class work in MNStars. Answer the question below and the next 3 questions about MNStars. You start by watching cell divisions and observe that the first cleavage is meaning it generates two separate cells. As development continues more cells are generated, each of which is known as a . As you continue to watch, you observe the formation of a fluid filled cavity known as a .  Shortly thereafter, the some cells begin to move and rearrange, indicating that the developmental stage known as has begun.  

Once the sea urchin sperm has chemotaxed to an egg of the sa…

Once the sea urchin sperm has chemotaxed to an egg of the same species to fertilize it, there are additional steps that involve species specificity. Identify two such such steps, and for each, 1) briefly describe the biological role for the step (i.e. what happens when it occurs) and 2) identify the molecules and describe their locations. (Do not use chemotaxis).

Loss-of-function mutations in PLCzeta (Phospholipase C zeta)…

Loss-of-function mutations in PLCzeta (Phospholipase C zeta) are associated with human infertility. Explain why this is the case, making sure to include three things:  1) the function of PLCzeta, 2) the main biological consequence of PLC zeta loss-of-function human fertilization, and 3) whether the mutation is likely to be found in the male or female partner in a case of infertility.