Genetic mutations can have serious effects that are incompatible when they are essential for development. Sometimes chromosomal mutation is survivable, as in the case of trisomy 21. The condition that is caused by these mutations is termed
(A) a chromosomal disorder
(B) a genetic trait
(C) polygenetic inheritance
(D) oncogenetic
Ans: (A) a chromosomal disorder
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Which of the following zones has the highest productivity and biodiversity in the ocean?
a. neritic zone b. abyssal zone c. aphotic zone d. photic zone
Resting on top of the basilar membrane is the ____
a. organ of Corti b. semicircular canals c. cochlear duct d. scala tympani e. scala vestibuli
The critical ________ is the most important limiting factor that determines where a species lives.
Fill in the blank(s) with the appropriate word(s).
Examine Type 4 hypersensitivities by completing the sentence. Compared to Type 3 hypersensitivities, ____________ reactions primarily involve _________ cell activity.
A) Xenografts B) Delayed C) Autografts D) Contact dermatitis E) MHC 1 F) T G) Tuberculin H) Allografts I) GVHD J) Type 4