1. In some plants yellow (Y) is dominant to green (g). Cross two plants, one of
ID: 152094 • Letter: 1
Question
1. In some plants yellow (Y) is dominant to green (g). Cross two plants, one of which is heterozygous yellow and the other which is green. Answer the following questions A Give the genotypes of the parents B List the genotypes of the Fl C What is the phenotypic ratio? 2. Two tall plants produced a short plant. If tall is dominant to short, what are the genotypes of the parents? 3. In some plants green (G) stems are dominant to yellow (g) stems and tall (T) plants are dominant to short (t) plants Cross two plants, one of which is heterozygous green and heterozygous tall and the other plant which is yellow and homozygous tall. Answer the following questions A Give the genotypes of the parents B What is the phenotypic ratio of the F1?Explanation / Answer
Answer:
1).
It should be “y” for green, but “g” is given to indicate green in the question.
Heterozygous yellow (Yy) x Green (yy)-----Parents
y
Y
Yy (yellow)
y
yy (green)
F1 genotypes = Yy & yy
Phenotypic ratio = 1:1 = Yellow : green
2).
The genotype of both the parents is heterozygous, Tt
Tt (tall) x Tt(tall) ----Parents
T
t
T
TT (tall)
Tt (tall)
t
Tt (tall)
tt (short)
3).
GgTt (heterozygous plant) x yellow, heterozygous tall plant (ggTt)---Parents
gT
gt
GT
GgTT (green, tall)
GgTt (green, tall)
Gt
GgTt (green, tall)
Ggtt (green, short)
gT
ggTT (yellow, tall)
ggTt (yellow, tall)
gt
ggTt (yellow, tall)
ggtt (yellow, short)
F1 phenotypic ratio: 3:1:1:3
Green, tall = 3
Green, short = 1
Yellow, short = 1
Yellow, tall = 3
y
Y
Yy (yellow)
y
yy (green)
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