Quercus alba (while oak) and Quercus macroloba (burr oak) never make hybrids in

Question

Quercus alba (while oak) and Quercus macroloba (burr oak) never make hybrids in nature because they occur in different habitats. They have very differently shaped leaves, fruits, and bark. In botanical gardens, however, where they can be grown side by side, they often make viable offspring (that is, they produce offspring that they themselves can produce offspring). a. What prevents crosses from occurring between the two species in nature, a premating or postmating isolating mechanism? b. In your opinion, are white and burr oaks different biological species? Why?

Explanation / Answer

ANSWER:

Burr oak and White oak never make hybrids in nature.They have differently shaped fruits ,leaves and bark.

A) Premating Isolating mechanisms prevents crosses from occuring between the two species in nature.Premating isolating mechanisms are  reproductive characteristics which prevent species from fusing. Isolating mechanisms are particularly important in the biological species.

B) They are reproductively isolated in nature,so they are different biological species.

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