If a geneticist describes a trait as being 70% penetrant, what would they mean?
A. Individuals with the trait show variation in expression
B. It is lethal in 30% of the individuals who have the trait
C. Only 70% of the individuals who carry the allele(s) for a trait express the trait
D. The trait is present in 70% of the population
C
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Which of the following has emerged as one of the leading organisms responsible for death in AIDS patients?
A. Pneumocystis jiroveci B. Acanthamoeba C. Toxoplasma gondii D. Naegleria
During which days of the ovarian cycle is the oocyte ovulated?
a. 12 - 15 b. 16 - 19 c. 0 - 4 d. 24 - 28 e. 3 - 6
Which of the following will increase the loading of oxygen onto the hemoglobin molecule within the lungs?
A) decreased pH B) decreased hydrogen ion concentration C) increasedPCO2 D) increased 2,3-bisphosphoglycerate (2,3-BPG) E) increased body temperature
In C4 plants, reactions that fix CO2 into four-carbon compounds occur in what type of cells?
a. guard cells b. xylem cells c. epidermal cells d. mesophyll cells e. bundle sheath cells