(a) Definition of crop improvement: This is the science (ii) that deals with the development of new crop varieties with superior quality and quantity.
(b)

	TC	Tc	tC	tc
TC	(TTCC)	TTCc	TtCC	TtCc
Tc	TTcC	(TTcc)	TtcC	Ttcc
tC	tTCC	tTCc	ttCC	ttCc
tc	tTcC	tTcc	(ttcC)	(ttcc)

(c) Tall Coloured: TTCC, TTCc, TtCC, TtCc, TTcC, TtcC, tTCC, tTCc, tTcC = 9
Tall white: TTcc, Ttcc, tTcc, = 3
Dwarf Coloured: ttCC, ttCc, ttcC = 3
Dwarf white: ttcc = 1 ,.
Calculation of percentage of plants that are:
Tall Coloured = 9/16 x 100 = 56.25%
(ii) Tall White = 3/16 x 100 = 18.75%
(iii) Dwarf Coloured = 3/16 x 100 = 18.75%
(iv) Dwarf White = 1/16 x 100 = 6.25% %
Total = 100.00%