In Drosophila, there are 2 linked genes, one that has a wild type allele for red eyes (p+) and a mutant allele for purple eyes (p) and the other gene is for wild type normal wings (vg+) and mutant vestigial wings (vg). If a test cross is conducted with a cis (coupling) heterozygote fly and a double mutant, you obtain a 24% recombination frequency. Based on this information, what percentage of red, normal winged flies would you expect to see in this cross?
a) 76%
b) 38%
c) 12%
d) 24%
Ans: b) 38%
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The Km for enzyme Q is 1 × 10-6 M. Q catalyzes the reaction R?S at a velocity of 30 µmole/min when the concentration of substrate is 0.02 M; hence, Vmax is approximately 30 µmole/min
Assuming Michaelis-Menten kinetics is followed, what will the reaction velocity be when [S] is 10-7 M? A. 30 µmole/min B 3.0 × 10-7 µmole/min C. 2.7 µmole/min D. 2.7 × 10-12 µmole/min E. 0.27 µmole/min
Mutations in the DFNA20/26 locus, which codes for the actin gamma 1 protein, are associated with congenital deafness. An irate senator complains that government money is being wasted on studies of this mutant gene -- in yeast! "I am no biologist," says the senator, "but I am pretty sure yeast don't have ears." How do you respond?
A. "You are right, Senator -- yeast do not have ears. We should revoke the funding immediately." B. "We can learn valuable information about the structure of the mutant protein by expressing it in yeast. It is difficult to collect large amounts of actin from tiny hair cells, and unethical to collect it from human patients." C. "We can learn valuable information about the transcription of the mutant gene in yeast. It is much more difficult to study transcription in human cells." D. "We can learn valuable information about sound transmission through the mutant yeast. By placing a speaker against a yeast vial and recording sound from the other side, we can infer how the mutant actin affects sound waves." Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about mutant genes? What other information is related to the question? Choose Answer Given what you now know, what information is most likely to produce the correct answer? Reflect on Process Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Which of the following is a challenge to the hypothesis that bats, which produce an unusually large number of sperm, increase the probability of conception when females engage in multiple matings? I) Female bats can eject the sperm of certain males
after mating. II) A female can actively choose which male mates with her last, thus increasing the odds of conception with that male's sperm. A) Only I is correct. B) Only II is correct. C) Both I and II are correct.
A population of rabbits introduced to an island grows rapidly for a few years, and then growth slows and stabilizes. The population becomes stable because:
A) environmental resistance declined. B) the intrinsic rate of increase has declined. C) immigration was reduced. D) the carrying capacity has been reached.