Imprinting affects the phenotype when
A) both alleles of a gene are imprinted.
B) both alleles of a gene are inactivated or deleted.
C) one allele is imprinted and the other is inactivated or deleted.
D) an embryo arises from two female genomes or two male genomes.
C) one allele is imprinted and the other is inactivated or deleted.
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Which sequences would likely have both a nucleosome-depleted region (NDR) and a poly A/T tract to attract transcriptional activators to a transcription start sequence?
A) chromatin modifiers B) enhancers C) open promoters D) closed promoters E) insulators
The male part of the flower is the ________
A) petal B) stamen C) carpel D) sepal
A growing root comes into contact with a chemical that inhibits the Golgi bodies. Which of the following would be a probable effect of this contact?
A. The root would begin to growing in an upward direction. B. The root cap cells would begin to divide rapidly. C. The root would begin to simultaneously grow in multiple directions. D. The root would not be slick enough to move through the soil easily. E. The root would produce too much mucigel and oxygen uptake would be inhibited.
When two species cannot form hybrid zygotes, the mechanism that keeps the species separate is known as a(n) ________ isolating mechanism.
A. prezygotic B. hybridization C. differential D. adaptive E. postzygotic