In a certain variety of plants, a cross between a red-flowered plant and a white-flowered plant
produced an all-red flower F1. In the F2 there were 140 red-flowered plants, 50 cream-flowered plants,
and 65 white-flowered plants.
(a) Offer an explanation for this F2 ratio.
(b) What ratio would be produced in a testcross of the F1 hybrid?
(c) What ratio would be produced if all the white-flowered F2 plants were crossed among
themselves? What will be an ideal response?
(a) R-red, r-cream, A-color, a-albino;
9 R_ A_ red, 3 rr A_ cream, 4 __ aa white
(b) 1/4 red, 1/4 cream, 1/2 white
(c) all offspring would be white because all would be __ aa
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The binding of a plant hormone to its receptor
typically induces
a. an increase in membrane permeability. b. an enzyme-substrate cascade. c. an inhibition of protein synthesis. d. a change in gene expression. e. increased DNA replication activity
The ________ ear not only detects sound, but also detects gravity and movement
Fill in the blank(s) with correct word
Which respiratory structure likely has the largest surface area for gas exchange to occur?
A) the body surface of a worm B) the lungs of a pig C) the tracheal system of a house fly D) the gills of a trout