What is the frequency of the B allele?
A) 0.001
B) 0.002
C) 0.100
D) 0.400
E) 0.600
Ans: E) 0.600
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What is the vaginal opening sometimes called?
A. Fourchette B. Perineum C. Introitus D. Mons pubis
The ____ valve guards the opening between the right atrium and the right ventricle
a. tricuspid b. bicuspid c. semilunar d. atrial e. mitral
In later chapters, you will learn more about the regulation of gene expression. One way to regulate gene expression is to make changes to the histone proteins to alter how tightly the DNA is coiled and wrapped. The more tightly coiled and wrapped a particular region of DNA is, the less likely it is that the genes in that region will be expressed. Bearing this in mind, how tightly do you think regions of heterochromatin are compacted?
A. loosely B. not at all C. very tightly D. moderately
Small, fishlike marine chordates, pointed at both ends with no distinguishable head, in which the notochord runs the entire length of the nerve cord, are called
A. tunicates. B. arrow worms. C. acorn worms. D. lampreys. E. lancelets.