Who demonstrated the crossover of homologous chromosomes in experiments on corn plants?
a. Frans Janssen and Curt Stern
b. Thomas Hunt Morgan and Alfred Sturtevant
c. Harriet Creighton and Barbara McClintock
d. Walter Sutton and Theodor Boveri
c. Harriet Creighton and Barbara McClintock
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Match the following items with the correct phrases.
_______1. The complete destruction of all living organisms, including cells, spores, and viruses. _______2. The use of antiseptics is an example of a __________ technique. _______3. Autoclaving for 15 to 20 minutes at 15 psi and 121°C is one method of accomplishing this. _______4. The destruction or removal of pathogens by physical or chemical methods. _______5. Heating to 60°C for 30 minutes is one method of accomplishing this; sufficient to kill pathogens and reduce total bacterial counts. _______6. Heating in a 160°C oven for 2 hours would accomplish this. _______7. The reduction of microbial populations to levels considered safe by public health standards. a disinfection b. pasteurization c. sanitization d. sterilization
Which of the following mutations can help lead to cancer?
A. Mutations to tumor suppressor genes B. Mutations to growth factors C. Mutations to proto-oncogenes D. All of the above would lead to cancer
What can be inferred if two species share a trait—such as birds’ and bats’ wings?
What will be an ideal response?
Understanding phenotype–genotype relationships is difficult because of:
a. pleiotropy. b. dominance. c. epistasis. d. A and C. e. All of the above.