Which of the following would have caused Mendel to observe patterns of inheritance that supported the model of blending inheritance rather than transmission of alleles causing discrete differences?
Comments: Mendel's observations of segregation, and subsequently independent assortment, were possible because he was observing traits with clear and discrete binary phenotypes caused by discrete alleles of single genes. When multiple genes influence traits, or multiple alleles are present, intermediate phenotypes are likely to occur. (As a note, all traits are affected by genotype and the environment, but the extent of environmental influence was minimized in Mendel's methods that involved observing plants raised in a single garden under very similar environmental conditions, thereby minimizing variation caused by fluctuations in the environment.)
A. Mendel chose traits controlled by more than a single gene.
B. Mendel chose traits controlled by a single gene, but that gene had more than two alleles affecting the phenotype.
C. Mendel chose traits affected by both the genotype and the environment.
D. All of the answer options are all correct.
D
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Based on the figure above, showing fetal (A) and adult (B) oxygen-hemoglobin saturation curves, which of the following conclusions is true?
A) The mother binds oxygen with greater affinity than the fetus. B) Adult saturation occurs at lower partial pressures of oxygen than fetal saturation does. C) At 50 percent saturation, fetal blood will have a higher affinity for oxygen than adult blood will. D) As the partial pressure of oxygen increases, adult hemoglobin approaches saturation faster than fetal hemoglobin does.
Certain plants that grow in environments where their roots are often under water need to provide ways of getting which of the following to the roots?
A. carbon dioxide. B. carbon monoxide. C. hydrogen. D. nitrogen. E. oxygen.
The osmotic response element discovered by Ferraris and her colleagues came from the promoter for
a. hexokinase. b. sorbitol dehydrogenase. c. aldose reductase. d. luciferase. e. sorbitase.
How many stop codons are there in the genetic code?
A. five B. one C. four D. two E. three