In a certain variety of plants, a cross between a redflowered

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?


Answer: (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

Biology & Microbiology

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