Question
If two tissues both induce further differentiation in each other, this is ____.
Answer
If two tissues both induce further differentiation in each other, this is reciprocal induction.
Real World Note: In development of the eyes, lateral outpocketings from the brain (optic vesicles) grow out and touch the overlying ectoderm. The optic vesicle induces the ectoderm to form the lens placode. The lens placode in turn induces the optic vesicle to create the optic cup. The optic cup then induces the lens placode to develop into the cornea and lens. Experiments with frog embryos show that if this ectoderm is subsequently transplanted to the trunk (after the optic vesicles have grown out), a lens will develop in the trunk. If, however, the ectoderm is transplanted before the outgrowth of the optic vesicles, it will not.
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____ is the joining of a sperm and an ovum.
Fertilization is the joining of a ____.
Fertilization occurs in the ____ of the fallopian tube.
The sperm uses ____ enzymes to penetrate the corona radiata and zona pellucida.
Once the sperm contacts the oocyte’s plasma membrane, the sperm establishes the a____nd injects its pronucleus.
Once the sperm contacts the oocyte’s plasma membrane, the sperm establishes the acrosomal apparatus and injects its ____.