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, 50 cream, and 65 white.
(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 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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Flagellated protozoans possess a layer of
elastic proteins just beneath the plasma membrane called the
a. pellicle. b. cilium. c. capsule. d. pillus. e. flagellum
The process that excretes undigested and unabsorbed residues is
a. absorption. b. assimilation. c. secretion. d. digestion. e. elimination.
External genitalia of the male reproductive system include the
A) ejaculatory duct. B) urethra and scrotum. C) penis and scrotum. D) penis. E) penis, urethra, and ejaculatory duct.