How do we know that the molecular function of a Hox gene is conserved across species?
What will be an ideal response?
ANS:
In experiments where homologous Hox genes have been transferred from species A to species B, the same homeotic transformations observed in species A are observed with the gene from species B.
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Cerebrospinal fluid is found in the ________.
A. arachnoid mater B. pia mater C. subarachnoid space D. dura mater E. All of the choices are correct.
In the process of blood clotting, platelets ____
a. engulf and digest cellular debris b. release substances that repel more platelets c. convert fibrin into fibrinogen d. clump together e. do nothing as they are not involved in clotting.
This term indicates that nearly all the individuals in the population have the same alleles.
A. genetic bottleneck B. frequency loss effect C. low genetic diversity D. genetic drift
During muscle contractions, ____.
A. the sarcomeres lengthen B. the actin and myosin filaments slide in the same direction C. the actin filaments move toward the middle of the sarcomere D. the muscle fibers elongate E. the muscle fibers are motionless