An individual carries the allele for polydactyly, but is normal. This is an example of __________
A. simple Mendelian inheritance
B. incomplete dominance
C. incomplete penetrance
D. codominance
E. gene dosage
C
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The biceps brachii is responsible for flexing the forearm while the triceps brachii extends the forearm. Muscles with such opposite actions are called
(a) cooperative. (b) antagonistic. (c) involuntary. (d) sensory.
Which statement best describes why an individual's antibodies and T cells do not attack their own cells?
A) Opsonins keep leukocytes from binding to the B and T cells B) B and T cells mature in the bone marrow and thymus; their antigen receptors are, in effect, tested for their potential to recognize and react against self. C) B and T cells develop into plasma cells which dissolve automatically into the plasma, thus they are not recognized as foreign. D) Interferons interfere with antibodies trying to attach to the B and T cells E) B and T cells have about 100,000 antigen receptors and so they can match anything in the human body.
A region of plant tissue where sugars are being produced or released from storage is called ____.
A. cortex B. plasmodesmata C. stoma D. a source E. a sink