Which of the following statements about
viruses is TRUE?
a. They were the first form of life to evolve.
b. They do not attack plants.
c. They are able to reproduce without using
other organisms.
d. They are made of protein only.
e. They include some forms that are able to
attack bacteria.
E
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In the late 1920s, a mutation occurred in many silver fox farms around the world. The fox farms that
sold expensive furs were proud of the quality of their furs, and each advertised that it had the best, purest breed of all the fox farms. The new mutations produced a "platinum" coat pattern that was commercially desirable, so the farms crossed them to get more. The results of their breeding experiments were as follows: (1) silver ? silver >>> all silver offspring; (2) silver ? platinum >>> equal numbers of silver and platinum; (3) platinum ? platinum >>> two platinum for each silver offspring. Explain. What will be an ideal response?
The Eustachian tube carries air from the middle ear to the
a. larynx. b. inner ear. c. pharynx. d. oval window. e. round window.
Which of the following statements is TRUE?
A. Alleles, genes, and loci are different names for the same thing. B. Genes have different versions, which are known as alleles. C. The phenotype of a dominant allele is never seen in the F1 progeny of a monohybrid cross. D. The genotype is the physical appearance of a trait.
Dybdahl and Lively conducted a survey of the proportion of a particular asexual snail clone in a population and the degree to which this clone was infected with a particular parasite
What prediction of the red queen hypothesis do the survey results appear to mirror? a. a correlation between parasite load and sexual reproduction b. oscillations in the relative frequency of asexual strains when parasites are present c. the emergence of host defense is synchronously tracked by parasite re-sponse d. a general decline of asexual lineages in the presence of parasites