4. In fruit flies, normal eyes (+) are dominant over small eyes (ey) and straight wings...

4. In fruit flies, normal eyes (+) are dominant over small eyes (ey) and straight wings (+) are dominant over curly wings (Cy). Work the following crosses through the F2 generation, and determine the genotypic and phenotypic ratios for each generation. Assume P1 individuals are homozygous: a. +, + x ey, Cy b. +, Cy x ey, + c. +, + x +, Cy

Solutions

Expert Solution

ey+ = Normal eyes
ey- = Small eyes

Straight wings = cy+
Curly wings = cy-

a. Parental cross: ey+/ey+ cy+/cy+ X ey-/ey- cy-/cy-
F1 progeny: ey+/ey- cy+/cy-
F1 phenotype = Normal eyes and straight wings
F1 selfing: ey+/ey- cy+/cy- X ey+/ey- cy+/cy-
F2 progeny:
Genotypic ratio = 1:1:1:1:2:2:2:2:4
Phenotypic ratio = 9:3:3:1
9/16 = ey+/_ cy+/_ = Normal eyes and straight wings
3/16 = ey+/_ cy-/cy- = Normal eyes and curly wings
3/16 = ey-/ey- cy+/_ = Small eyes and straight wings
1/16 = ey-/ey- cy-/cy- = Small eyes and curly wings

b. Parental cross: ey+/ey+ cy-/cy- X ey-/ey- cy+/cy+
F1 progeny: ey+/ey- cy+/cy-
F1 phenotype = Normal eyes and straight wings
F1 selfing: ey+/ey- cy+/cy- X ey+/ey- cy+/cy-
F2 progeny:
Genotypic ratio = 1:1:1:1:2:2:2:2:4
Phenotypic ratio = 9:3:3:1
9/16 = ey+/_ cy+/_ = Normal eyes and straight wings
3/16 = ey+/_ cy-/cy- = Normal eyes and curly wings
3/16 = ey-/ey- cy+/_ = Small eyes and straight wings
1/16 = ey-/ey- cy-/cy- = Small eyes and curly wings

c. Parental cross: ey+/ey+ cy-/cy- X ey+/ey+ cy-/cy-
F1 progeny: ey+/ey+ cy+/cy-
F1 phenotype = Normal eyes and straight wings
F1 selfing: ey+/ey+ cy+/cy- X ey+/ey+ cy+/cy-
F2 progeny:
Genotypic ratio = 1:2:1
Phenotypic ratio = 3:1
3/4 = ey+/ey+ cy+/_ = Normal eyes and straight wings
1/4 = ey+/ey+ cy+/_ = Normal eyes and curly wings

gladiator answered 1 year ago

Next > < Previous

Related Solutions

In fruit flies, straight wings is dominant over curly. Show how you would determine if a...

In fruit flies, straight wings is dominant over curly. Show how you would determine if a straight winged fly were heterozygous or homozygous? Please show work.

In fruit flies, a grey body is dominant to a black body, and normal wings are...

In fruit flies, a grey body is dominant to a black body, and normal wings are dominant to vestigial wings. Flies are heterozygous for both grey bodies and normal wings were crossed with flies that had black bodies and vestigial wings. The following results were obtained: Phenotype Number of flies Grey body/Normal wings 482 Black body/Vestigial wings 472 Grey body/Vestigial wings 103 Black body/Normal wings 92 The results indicate that the genes for wings and body color are on the...

Long wings in fruit flies are dominant to vestigial wings. A long winged fruit fly is...

Long wings in fruit flies are dominant to vestigial wings. A long winged fruit fly is crossed with a vestigial winged fly. What are the genotypes of the parents and offspring if the cross results in 72 long winged and 68 vestigial winged offspring.

In Drosophila, red eyes (E) are dominant over white (e) and normal wings (W) are dominant...

In Drosophila, red eyes (E) are dominant over white (e) and normal wings (W) are dominant over shriveled wings (w). Use the addition and multiplication rules to calculate the phenotypic ratios of the cross of Eeww and EeWw. 1. Cross of Ee x Ee: 2. Cross of ww x Ww: 3. Red eyes and normal wings: 4. Red eyes and shriveled wings: 5. White eyes and normal wings: 6. White eyes and shriveled wings:

In fruit flies, curved wings (c) are recessive to straight wings (C), and ebony body (g)...

In fruit flies, curved wings (c) are recessive to straight wings (C), and ebony body (g) is recessive to gray body (G). A cross was made between true-breeding flies with straight wings and gray bodies and flies with curved wings and ebony bodies. The F1 offspring were then mated to flies with curved wings and ebony bodies to produce an F2 generation (test-cross). The following offspring was observed: 114 curved wings, ebony body 105 curved wings, gray body 111 straight...

In fruit flies, curved wings (c) are recessive to straight wings (C), and ebony body (g)...

In fruit flies, curved wings (c) are recessive to straight wings (C), and ebony body (g) is recessive to gray body (G). A cross was made between true-breeding flies with straight wings and gray bodies and flies with curved wings and ebony bodies. The F1offspring were then mated to flies with curved wings and ebony bodies to produce an F2 generation (test-cross). The following offspring was observed: 114 curved wings, ebony body 105 curved wings, gray body 111 straight wings,...

In fruit flies, curved wings (c) are recessive to straight wings (C), and ebony body (g)...

In fruit flies, curved wings (c) are recessive to straight wings (C), and ebony body (g) is recessive to gray body (G). A cross was made between true-breeding flies with straight wings and gray bodies and flies with curved wings and ebony bodies. The F1offspring were then mated to flies with curved wings and ebony bodies to produce an F2 generation (test-cross). The following offspring was observed: 114 curved wings, ebony body 105 curved wings, gray body 111 straight wings,...

1.In fruit flies, eye color is an X-linked trait. Red eyes (XR) are dominant over white...

1.In fruit flies, eye color is an X-linked trait. Red eyes (XR) are dominant over white eyes (Xr)A homozygous dominant female mates with a white-eyed male. What is the phenotypic ratio among males? a.1:0 (all male offspring will have red eyes) b.1:1 (half of the male offspring will have red eyes and half will have white eyes) c.0:1 (all male offspring will have white eyes) 2.In fruit flies, eye color is an X-linked trait. Red eyes (XR) are dominant over...

Offspring of fruit flies may have red or brown bodies and normal wings or short wings....

Offspring of fruit flies may have red or brown bodies and normal wings or short wings. Genetic theory predicts that these traits will appear in the ratio 9:3:3:1 (9 red, normal: 3 red, short: 3 brown, normal: 1 brown, short). A researcher checks 100 such flies and finds the distribution of the traits to be 55, 20, 14, and 11, respectively. Compute the chi-square statistic. x²= critical value? P-value? Suppose you double the amount of flies to 200 and the...

Please Show work for full credit Fruit flies that breed true for normal wings, grey bodies...

Please Show work for full credit Fruit flies that breed true for normal wings, grey bodies and red eyes are crossed with flies that breed true for vestigial wings, black bodies and brown eyes. All the resulting offspring have normal wings and grey bodies and red eyes. The offspring are then crossed with flies with vestigial wings, black bodies, and brown eyes. The resulting offspring occur: 5 normal winged, black bodies, brown eyes 75 normal winged, black bodies, red eyes...

Subjects