Which of these is an INCORRECT matching of causative agent and disease?
a. Yersinia pestis: plague
b. Salmonella: food poisoning
c. Brucella: yellow fever
d. Clostridium: gas gangrene
Answer: c
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Children born with Down syndrome have inherited an extra chromosome, so their diploid number is 47 rather than 46 chromosomes. What is this genetic condition called?
A) trisomy 21 B) triploid C) haploid 21 D) monoploidy
Practices such ranchers allowing their livestock to overgraze grasslands contribute to ________________ of the habitat.
A. flooding B. deforestation C. desertification D. bioaccumulation E. carbon dioxide accumulation
Organisms demonstrated by the technique shown in Image A belong to the group known as:
a) Spirochetes b) Bacilli c) Mycobacteria d) Fungi
If one of Mendel's genes had three alleles that differentially affected the phenotype rather than two, what would he have observed among the progeny of many crosses between all pairs of the three pure-breeding lines in the F1 and F2 generations?
Comments: This case brings up the chance of codominance or incomplete dominance and provides for multiple phenotypes among a large set of crosses. In any one cross, there would be specific pure-breeding strains used, but there could be white, pink, and red flowers that are all pure breeding that may have complete or incomplete dominance. The population effects of this kind of genetics could move toward a broader range of phenotypes leading to the idea of blending inheritance. Mendel's innovative idea was to narrow the traits to simple binary phenotypes. This complication could show what could happen if he had not been so thoughtful. A. In each of the crosses, two phenotypes in the F1 generation. B. Only a single phenotype would be observed in the F1 generation because only one allele can be dominant. C. No evidence would exist for the law of segregation. D. No pure breeding plants produced in the F2. E. None of the responses are correct.