Question

1. Describe the mechanisms by which species specificity is established/maintained during fertilization.

2. Compare and contrast the inductive interactions involved in liver and pancreas formation.

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1. Describe the mechanisms by which species specificity is established/maintained during fertilization.

Choosing a mate that belongs to your species is critical to the success of your offspring. Primarily this is due to the unlikely ability of the embryo resulting from extra species breeding to develop properly into functional adults. And if they should do so there will likely be some other isolating mechanisms, behavioral in particular that would prevent the offspring from finding mates in either of the parental species.

The initial contact between the egg and the sperm is the primary means of preventing extra-specific fertilization. Sperm consists of highly condensed chromatin in a cell with no cytoplasm. The tip of the sperm contains an organelle, the acrosome or acrosomal vesicle which contains a collection of enzymes which are used to digest the surface of the egg to allow entry of the sperm....

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