What type of mutation would prevent both alleles of a gene from being expressed?
a. dominant
b. recessive
c. trans-acting
d. cis-acting
e. None of the above
Ans: c
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Consider a dihybrid cross of two true-breeding Drosophila: a male with red eyes and normal wings and a female with orange eyes and hairy wings. The F1 flies are of two types: orange eye, normal wing males and red eye, normal wing females. What can you conclude about the mutant traits, orange eye and hairy wing?
A: Both traits are recessive. B: The eye color gene is sex-linked. C: The wing hair trait is sex-linked. D: Both A and B E: Both A and C.
What is the most reasonable conclusion that can be drawn from the fact that the frequency of the recessive trait (aa) has not changed over time?
A) The two phenotypes are about equally adaptive under laboratory conditions. B) The genotype AA is lethal. C) There has been a high rate of mutation of allele A to allele a. D) There has been sexual selection favoring allele a.
Ribosome movement along the mRNA is called
A. initiation. B. replication. C. activation. D. transcription. E. translocation.
The source of a fruit produced by an angiosperm is its:
A) sepal. B) endosperm. C) seed. D) ovary wall.