The passageway that extends from the middle ear to the throat is the ________; this structure equalizes air pressure in the middle ear with atmospheric pressure
Fill in the blank(s) with correct word
eustachian tube; auditory tube (either term can be used here)
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Rough periwinkles that live in the splash zone use ____ for respiration
a. gills b. lungs c. the mantle cavity d. the foot e. the radula
All cells in an embryo have the same genes, but they express different subsets of this genome. Selective gene expression is the basis of:
a. cleavage b. cell differentiation c. fertilization d. gamete formation e. organ maturation
Which is false regarding the GGC gene?
a. It is present in humans, mollusks, and insects. b. It codes for an enzyme that regulates pattern formation in cone shells. c. It is more than 500 million years old. d. Today the enzyme product of the gene has different functions in different lineages. e. None of these are false.
Typical ratios resulting from epistatic interactions in dihybrid crosses would be ________
A) 3:1, 1:1 B) 9:3:3:1, 1:2:1 C) 1:2:2:4:1:2:1:2:1, 1:2:1 D) 1:1:1:1, 1:4:6:4:1 E) 9:3:4, 9:7