When the two alleles CR CW are the genotype of an individual, that person displays features of both alleles. This is known as
A. polygenic inheritance.
B. multiple alleles.
C. complete recessiveness.
D. codominance.
D. codominance.
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Choose the option that places the following events in plant defense in the correct order:
1. Plant cell recognizes double-stranded RNA (dsRNA) as foreign and cleaves it into fragments. 2. Single-stranded RNA (ssRNA) molecules bind to the protein-bound small interfering RNA (siRNA) and are destroyed. 3. A virus infects the host plant, injecting ssRNA into the cell. 4. Viral genome is replicated and dsRNA molecules are formed. 5. siRNA bind to a plant protein complex, which retains only one of the RNA strands. A. 3 2 1 4 5 B. 1 2 4 3 5 C. 5 3 4 2 1 D. 1 2 3 4 5 E. 3 4 1 5 2
Differential gene expression is defined as:
a. the ability of some cells to arrest their development under different environmental conditions. b. the progressive fixation of the fates of a cell's descendants. c. the differences in the types of genes found in various somatic cells. d. regulation during development that varies the type and quantity of gene products among cells. e. the ability of some cells to constitutively express all their genes all the tim
The same bees that pollinate the flowers of the Brazil nut trees also pollinate orchids, which are epiphytes (in other words, plants that grow on other plants); however, orchids cannot grow on Brazil nut trees. These observations explain _____
A) the coevolution of Brazil nut trees and orchids B) why Brazil nut trees do not set fruit in monoculture plantations C) why male orchid bees do not pollinate Brazil nut tree flowers D) why male orchid bees are smaller than female orchid bees
Which of the following should I adjust on my microscope when the high power lens is in place, but the specimen I am viewing is not completely in focus?
a. Coarse adjustment knob b. Fine adjustment knob c. Iris diaprhagm d. Stage e. Condenser