Pod characteristics are effected by a number if genes. Pod color (green dominant to yellow), pod...

Pod characteristics are effected by a number if genes. Pod color (green dominant to yellow), pod surface (rough is recessive to smooth), and pod width (wide is dominant to narrow). Pod color and pod surface are 10 map units away. True breeding plants with green, wide, and smooth were mated with yellow, narrow, and rough. This plant was test crossed. If 1000 testcross progeny were examined, how many are expected to have yellow, wide, and rough pods?

Expert Solution

Answer:

Expected to have yellow, wide, and rough pods = 250

Explanation:

Pod color (green (G) dominant to yellow(g)), pod surface (rough(r) is recessive to smooth(R)), and pod width (wide (W) is dominant to narrow(w)).

Map distance (mu)= % of recombination frequency

10 mu = 10% recombinants

green, wide, and smooth (GGRR; WW) X yellow, narrow, and rough(ggrr ; ww) ----------Parents

GR; W gr; w -----------------------------------------------------Gametes

GR / gr ; W/w ----------------------------------------------F1 (green, wide, and smooth)

GR / gr ; W/w x gr/gr; w/w ----------Testcross

	gr/w
GR; W (22.5%)	GR/gr; Ww -green, smooth, wide (22.5%)---225
GR; w (22.5%)	GR/gr; ww -green, smooth, narrow (22.5%)---225
gr; W (22.5%)	gr/gr; Ww -yellow, rough, wide (22.5%)---225
gr w (22.5%)	gr/gr; ww -yellow, rough, narrow (22.5%)---225
Gr; W (2.5%)	Gr/gr; Ww -green, rough, wide (22.5%)---25
Gr; w (2.5%)	Gr/gr; ww -green, rough, narrow (22.5%)---25
gR; W (2.5%)	gR/gr; Ww -yellow, rough, wide (22.5%)---25
gR; w (2.5%)	gR/gr; ww -yellow, smooth, narrow (22.5%)---25

yellow, rough, wide = 225+25 = 250

gladiator answered 2 years ago

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