In Drosophila, gray body color is dominant to ebony body color, while long wings are dominant to vestigial wings. Assuming that the P1 individuals are homozygous, work the following crosses through the F2 generation, and determine the genotypic and phenotypic ratios for each generation. Body color Wing length E = gray V = long e = ebony v = vestigial

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12-11-2019
Biology

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In Drosophila, gray body color is dominant to ebony body color, while long wings are dominant to vestigial wings. Assuming that the P1 individuals are homozygous, work the following crosses through the F2 generation, and determine the genotypic and phenotypic ratios for each generation. Body color Wing length E = gray V = long e = ebony v = vestigial

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areebarao areebarao · Answer 1 · 2019-11-13T19:48:58+01:00

Answer:

The phenotypic and genotypic ratios for each generation are determined below.

Explanation:

As we assume P1 individuals are homozygous (i.e EE, VV, ee, vv)

P1 Generation:

gray long winged X ebony vestigial winged

EEVV X eevv

Gametes:

E V X e v

F1 Geneation:

EeVv ---------------> All heterozygous gray long winged .

Ratio for genotype:

100% heterozygous gray long winged

For F2 Generation:

F1 x F1

EeVv X EeVv

Punnett Square for dihybrid cross:

EV Ev eV ev

--------------------------------------------------------------

EV EEVV EEVv EeVV EeVv

Ev EEVv EEvv EeVv Eevv

eV EeVV EeVv eeVV eeVv

ev EeVv Eevv eeVv eevv

RATIO OF PHENOTYPE:

Gray long winged : Gray short winged : Ebony long winged : Ebony short winged

9 : 3 : 3 : 1

RATIO OF GENOTYPE:

EEVV : EEVv : EeVV : EeVv : EEvv : Eevv : eeVV : eeVv : eevv

1 : 2 : 1 : 2 : 4 : 2 : 1 : 2 : 1

aliasger2709 aliasger2709 · Answer 2 · 2022-03-18T09:56:59+01:00

Dominant and the recessive are the two forms of the alleles of the genes. The ratio of the F2 cross in Drosophila will be 9:3:3:1.

What is heterozygous and purebred?

Heterozygous is the pair of the trait in a recessive and dominant form while the purebred is the condition that has the same pair of dominant or recessive alleles.

The dominant alleles are grey (E) and have long wings (V) while the recessive is of the ebony (e) color and vestigial wings (v).

The parent is purebred (P1) = EEVV and eevv

See the attached image below for the cross.

The phenotypic ratio of the cross can be given as:

Gray long-winged : Gray short-winged : Ebony long-winged : Ebony short-winged = 9:3:3:1

The genotypic ratio of the cross can be given as:

EEVV : EEVv : EeVV : EeVv : EEvv : Eevv : eeVV : eeVv : eevv = 1 : 2 : 1 : 2 : 4 : 2 : 1 : 2 : 1

Therefore, the genotypic ratio of the F1 will be 100% heterozygous gray long-winged and 9:3:3:1 is the phenotypic ratio of the F2 generation.

Learn more about dihybrid cross here:

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