What made the plant hybridization studies performed by Mendel more successful than plant hybridization studies performed by others?
A. Mendel did not use true-breeding
organisms because he wanted to assess the
inheritance of more than one trait per
breeding.
B. Mendel was the first to identify
characteristics of pea plants that could be
observed as phenotypes.
C. Mendel's understanding of natural
selection inspired his methodology to
examine the effect of environmental stressors
on genetic diversity.
D. Mendel used statistical analysis to analyze
the phenotypes he observed.
E. Mendel used qualitative analysis to
evaluate the genotypes he observed.
D
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In order to verify a hypothesis, scientists
a. perform experiments and/or make observations. b. consider facts. c. establish law. d. develop theories. e. make predictions
Most bacteria are:a
photoheterotrophs. b. chemoheterotrophs. c. autotrophs. d. heterotrophs. e. chemoautotrophs.
The crayfish has a cavity or "statocysts" lined with sensory setae or hairs. A grain in the cavity is pulled downward by gravity; the pressure against the bottom hairs of the cavity gives the crayfish a perception of being upright and, when it changes orientation, the grain touches side hairs that make it realize it is not upright. Thus the crayfish "knows" which way is up in the dark. This sense is most closely related in function to the human sense of
A. hearing. B. sight. C. smell. D. hot and cold. E. balance.
Cells are always producing proteins from every gene they possess.
a. true b. false