A testcross involves an individual with the dominant phenotype but unknown genotype being crossed with an individual that has a(n) ________ genotype.
A. homozygous recessive
B. homozygous dominant
C. heterozygous dominant
D. Any of the choices.
Answer: A
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A reduction in the number of circulating erythrocytes results in which disorder?
A. anemia B. polycythemia C. thrombosis D. hematoma E. lupus erythromatosus
The first disease to be identified as being caused by a virus was tobacco mosaic disease.
Answer the following statement true (T) or false (F)
The light reactions of photosynthesis occur within the ________ of the chloroplast and the Calvin cycle reactions occur within the ________ of the chloroplast.
A. stroma; outer membrane B. thylakoid; stroma C. stroma; thylakoid D. thylakoid; outer membrane
The wings of bats and birds and the flippers of porpoises are
a. analogous structures. b. totally unrelated. c. functionally different. d. homologous structures. e. similar by chance.