The evolution of initiation of limb development in tetrapods is best explained by 

A. a new gene mutation.
B. the modification of an existing gene for a new function.
C. homoplastic convergence.
D. gene duplication and divergence.
E. conserved genes.


B. the modification of an existing gene for a new function.

Biology & Microbiology

You might also like to view...

In some arthropods tagmatization has produced a combination of head and thorax known as a  

A.  cephalothorax. B.  fused corpora. C.  headless mite. D.  larval instar. E.  thoracotomy.

Biology & Microbiology

Imprinting disorders illustrate

A) epistasis. B) epigenetics. C) epidermics. D) apogenetics.

Biology & Microbiology

The primary muscle(s) involved in human breathing is/are called the

a. external intercostals. b. internal intercostals. c. diaphragm. d. abdominal wall muscles. e. lung muscles.

Biology & Microbiology

How is tuberculosis transmitted?

A) by sexual contact B) by contaminated food C) by sneezes D) by infected blood products

Biology & Microbiology