In 1999,researchers Found That They Could Create Hybrid Embryos Between

Multiple Choice

In 1999,researchers found that they could create hybrid embryos between two species of sea urchin that had been separated for 10 million years.By treating eggs to remove the jelly coat,the sperm of the other species was able to fertilize.What step of the fertilization process is normally blocked,preventing hybridization between these species?

A) Sperm penetration
B) Membrane fusion
C) Egg activation
D) Nuclear fusion