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.