An allele for a particular trait that is only expressed in the presence of a second copy of the same allele is called  

A.  dominant.
B.  codominant.
C.  incompletely dominant.
D.  recessive.
E.  pleiotropic.


D.  recessive.

Biology & Microbiology

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Although the Proconsul fossil has a monkeylike body, it is considered the oldest (20 mya) fossil with hominoid

features such as larger canine teeth. ____________________ Indicate whether the statement is true or false.

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Tumor suppressor genes can be split into the two categories of ________ and ________ genes

Fill in the blank with correct word.

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Which one of the following is NOT an example of behavior? 

A. A plant bending toward a light B. A student sleeping in class C. The wind rustling fallen autumn leaves D. A cat purring

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During the process of phosphorylation, ____.

A. a molecule gains a phosphate group B. a molecule synthesizes a phosphate group C. molecules become more stable D. molecules are passed to enzymes E. ADP is produced from ATP

Biology & Microbiology