(1 point) In a species of snapdragons, flowers can be white, solid yellow, or sp
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Question
(1 point) In a species of snapdragons, flowers can be white, solid yellow, or spotted. This trait is determined by two separate gene loci. The first gene locus determines pigmentation pattern, where solid yellow (Y) is dominant over spotted (y). The second gene locus produces an inhibitor of pigment production, where the dominant I results in inhibition of pigment production (and therefore white color) and the recessive i does not result in inhibition of pigment production (so that the solid yellow or spotted phenotypes are visible) a) What class of epistasis (recessive, dominant, or complementary gene action) is represented by this example? Explain your answer. b) Based on the description above, determine the phenotype of each of the following genotypic classes: Y I Y ii yy yyii: c For each of the following crosses, determine the genotypes of both parents Phenotypes of offspring Phenotypes of Parents 1) White X Solid Yellow 100 white, 80 Solid Yellow; 28 Spotted 2) White X Solid Yellow 102 white, 48 Solid Yellow, 52 Spotted 3) White X Spotted 105 white; 45 Solid Yellow; 48 Spotted 4) Solid Yellow X Solid Yellow 148 Solid Yellow; 55 Spotted 5) White X White 145 white; 43 Spotted 200 white 60 White X Solid YellowExplanation / Answer
Answer:
a). Dominant epistasis
b).
Y_I_ : White
Y_ii : Solid yellow
yyI_ : white
yyii : spotted
c).
Parents
Offsprings
Cross no
Phenotype
Gneotype
Phenotype
Gneotype
Phenotypes
1
White
YyIi
Solid yellow
Yyii
100 white
80 solid yellow
28 spotted
2
White
yyIi
Solid yellow
Yyii
102 white
48 solid yellow
52 spotted
3
White
YyIi
Spotted
yyii
105 white
45 solid yellow
48 spotted
4
Solid yellow
Yyii
Solid yellow
Yyii
148 solid yellow
55 Spotted
5
White
yyIi
White
yyIi
145 white
43spotted
6
White
YYII
Solid yellow
YYii
200 white
d)
White of cross 1 (YyIi) X Solid yellow of cross 2 (YYii)------Parents
Yi
YI
YYIi (white)
Yi
YYii (Solid yellow)
yI
YyIi (White)
yi
Yyii (Solid yellow)
White : Solid yellow = 1 : 1
Parents
Offsprings
Cross no
Phenotype
Gneotype
Phenotype
Gneotype
Phenotypes
1
White
YyIi
Solid yellow
Yyii
100 white
80 solid yellow
28 spotted
2
White
yyIi
Solid yellow
Yyii
102 white
48 solid yellow
52 spotted
3
White
YyIi
Spotted
yyii
105 white
45 solid yellow
48 spotted
4
Solid yellow
Yyii
Solid yellow
Yyii
148 solid yellow
55 Spotted
5
White
yyIi
White
yyIi
145 white
43spotted
6
White
YYII
Solid yellow
YYii
200 white
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