The Two Major Forces Contributing to Allopatric Speciation Are

question 21

Multiple Choice

The two major forces contributing to allopatric speciation are:

• A) mutation and natural selection.
• B) natural selection and migration.
• C) nonrandom mating and migration.
• D) natural selection and genetic drift.
• E) genetic drift and mutation.

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Definitions:

T Lymphocyte

A type of white blood cell that plays a central role in the immune response by attacking foreign invaders and cancer cells.

Memory T Cells

A type of T cell that remains in the body after an initial infection and helps to quickly respond to the same antigen upon re-exposure.

Antigenic Determinant

Specific part of an antigen that stimulates an immune system response by binding to receptors on the surface of lymphocytes; also called epitope.

Cell-mediated Immunity

A type of immunity where T cells directly attack infected or cancerous cells, as opposed to producing antibodies.