Even though sickle-cell disease is inherited as an autosomal recessive disorder, the heterozygote can express some variation of the recessive phenotype.
Answer the following statement true (T) or false (F)
True
Sickle-cell heterozygotes have sickle-cell traits in which the blood cells are normal unless they experience dehydration or mild oxygen deprivation.
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If genetically different strains of corn are grown in a greenhouse and subject to identical environmental conditions, then differences in height would be due to genetic differences and:
A. the heritability measure would be 100%. B. the heritability measure would be 0%. C. the heritability measure would indicate that the environment has no effect on inheritance of the trait. D. the heritability measure would suggest that the genotypic differences have no effect on the inheritance of the trait. E. None of these answer options is correct.
Which of the following antibiotics are produced by members of the genus Bacillus?
A. Gramicidin B. Bacitracin C. Polymyxin D. All of the choices are correct.
After reaching the inner ear, the frequency of a sound primarily affects
A. the vibrational amplitude of the tectorial membrane. B. the location of the greatest basilar membrane vibration. C. the amplitude of basilar membrane vibration.
A key is placed into a keyhole then turned and the door opens. When considering the components of cell signaling, the action of turning the key would best correspond to
A. the binding site of the receptor. B. signal transduction that occurs when the receptor binds the hormone. C. the concentration of the hormone. D. the cell response that occurs when the receptor binds the hormone. E. conformational change in the receptor once bound to the hormone.