In fruit flies, the genes for body color and wing shape are linked. When a dihybrid black straight-winged fly is test-crossed with a double-recessive brown curly-winged fly, the frequency at which black curly-winged and brown straight-winged flies are seen in the progeny is called the _______ frequency.
A: mutation
B: recombinant
C: allele
D: parental
E: meiotic
Ans: B: recombinant
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The enzyme ________ breaks down the extracellular matrix to facilitate angiogenesis.
Fill in the blank(s) with the appropriate word(s).
In the region of budding, the plasma membrane acquires
A. carbohydrates. B. spike proteins. C. matrix proteins. D. enzymes. E. spike proteins AND matrix proteins.
A graded, subthreshold change in the postsynaptic membrane potential that moves it toward threshold
is called a(n)
a. IPSP. b. hyperpolarization. c. EPSP. d. depolarization. e. repolarization.
The following events took place in a rice plant. Arrange them in order of occurrence
1 . Seed formation takes place in the ovary. 2 . Self-pollination. 3 . Double fertilization takes place in the female gametophyte. 4 . Pollen is produced in the anther. 5 . The mature rice grains are harvested. a. 5, 4, 3, 2, 1 b. 4, 2, 1, 3, 5 c. 4, 2, 3, 1, 5 d. 4, 3, 2, 1, 5 e. 4, 2, 3, 5, 1