Using the provided figure, what percentage of offspring between a cross of an RR individual to an Rr individu-al will be red? The RR flower is red, the Rr flower is pink, and the rr flower is white
a. 0%
b. 25%
c. 50%
d. 75%
e. 100%
C
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After a decline to an historic low about 300 million years ago, carbon dioxide levels in the Earth's atmosphere rose again for a while. Hypothesize a reason why this occurred.
A. All the vegetation that had been produced prior to the historic low decayed, releasing carbon dioxide. B. Higher oxygen levels resulted in the proliferation of aerobic bacteria; their respiration released large amounts of carbon dioxide. C. Higher temperatures caused an increase in plant growth, resulting in an increase in the amount of carbon dioxide synthesized. D. Lower temperatures resulted in reduced plant growth; with less vegetation to absorb carbon dioxide, the carbon dioxide levels rose. E. Higher oxygen levels promoted large-scale fires across the landscape; the breakdown of organic molecules in these fires released carbon dioxide.
Andalusian chickens with the genotype CBCB are black, those with the genotype CBCW are gray. What is the relationship between the CB and the CW alleles?
A) CB is dominant to CW. B) CB is recessive to CW. C) CW is dominant to CB. D) The relationship is one of incomplete dominance. E) CB and CW are codominant.
Which of the following Brucella species is most likely indicated in this case?
a. Brucella abortus b. Brucella suis c. Brucella melitensis d. Brucella canis
E. coli cells grown on 15N medium are transferred to 14N medium and allowed to grow for two more generations (two rounds of DNA replication). DNA extracted from these cells is centrifuged
What density distribution of DNA would you expect in this experiment? A) one high-density and one low-density band B) one intermediate-density band C) one high-density and one intermediate-density band D) one low-density and one intermediate-density band E) one low-density band