In maize, a "mutable" allele results from
a. the loss of an autonomous transposon.
b. the insertion of an autonomous transposon.
c. the loss of a nonautonomous transposon.
d. the loss of the ability of an autonomous transposon to transpose.
e. the insertion of a nonautonomous transposon.
Ans: b
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Once a mother has been sensitized to the Rh factor,
A. she can be given RhoGAM in future pregnancies to prevent hemolytic disease of the newborn. B. only future Rh- fetuses are at risk. C. all other Rh+ fetuses are at risk. D. she can never again have a low risk pregnancy. E. None of the choices are correct.
Calvin Bridges, an associate of Thomas Hunt Morgan's, found further evidence that genes were located on chromosomes. Which of the following is not a component of his study?
A. He crossed white-eyed females (XwXw) with red-eyed males (XWY). B. The F1 progeny were mostly the red-eyed males and white-eyed females expected. C. A few rare white-eyed females and red-eyed males were observed, which he called primary exceptionals. D. He proposed that the rare white-eyed females were the result of abnormal chromosome number. E. Abnormal chromosome number was a result of nondisjunction in the female fly.
In the lactose operon, the repressor binds to:
a. the lacI coding region. b. the promoter. c. the operator. d. the lacZ coding sequence. e. the lacY coding sequence.
Population control factors that arise from outside the population are called
A. extrinsic limiting factors. B. density-independent limiting factors. C. intrinsic limiting factors. D. density-dependent limiting factors.