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In the fruit fly Drosophila, a rudimentary wing called “vestigial” and dark body color called “ebony” are inherited at independently assorting genes and are recessive to their dominant wild-type counterparts, full wings and gray body color. Wild-type males and females heterozygous for both traits are crossed, and 3200 progeny are produced.

How many progeny flies are expected to be found in each phenotypic class?

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Related questions

Hello please help.


1.In wild-type fruit flies, gray body G and regular wings R aredominant to black body g and vestigial wings r. A wild-type fruitfly homozygous for gray body and regular wings is crossed with ablack bodied vestigial winged fly.

a. If the resulting heterozygous offspring were crossed with aknown homozygous recessive individual and the two traits were notlinked, what would be the phenotypes and the frequencies of thiscross?

b. However, the above cross yielded the following phenotypes andfrequencies, independent of sex: 40% of the offspring weregray-regular, 40% of the offspring were black-vestigial, 10% of theoffspring were gray-vestigial, and 10% of the offspring wereblack-regular. What kind of inheritance is being demonstratedhere?

c. How many map units is body color from wing length?

d. If a third trait (eye color) is known to be 10 map units fromwing length and 10 map units from body color, show the sequence ofgenes on this chromosome.

Hello please help.


1.In wild-type fruit flies, gray body G and regular wings R aredominant to black body g and vestigial wings r. A wild-type fruitfly homozygous for gray body and regular wings is crossed with ablack bodied vestigial winged fly.

a. If the resulting heterozygous offspring were crossed with aknown homozygous recessive individual and the two traits were notlinked, what would be the phenotypes and the frequencies of thiscross?

b. However, the above cross yielded the following phenotypes andfrequencies, independent of sex: 40% of the offspring weregray-regular, 40% of the offspring were black-vestigial, 10% of theoffspring were gray-vestigial, and 10% of the offspring wereblack-regular. What kind of inheritance is being demonstratedhere?

c. How many map units is body color from wing length?

d. If a third trait (eye color) is known to be 10 map units fromwing length and 10 map units from body color, show the sequence ofgenes on this chromosome.

Below are data from a three-point linkage experiment in Drosophila melanogaster. These data represent the offspring from a testcross between flies expressing the recessive mutant phenotypes for black body, vestigial wings and brown eyes and flies that express normal wild type phenotypes but are heterozygous for all three traits. All the heterozygous wild type parental flies in this cross start out with mutant alleles in the cis configuration. Answer the following questions based on these data and show your work for question 1 (a-d).

Body

Wing

Eye

Phenotype

Count

b+

vg+

bw+

Gray body, normal wings, red eyes

103

b

vg

bw

Black body, vestigial wings, brown eyes

95

b+

vg

bw

Gray body, vestigial wings, brown eyes

32

b

vg+

bw+

Black body, normal wings, red eyes

29

b+

vg+

bw

Gray body, normal wings, brown eyes

71

b

vg

bw+

Black body, vestigial wings, red eyes

68

b+

vg

bw+

Gray body, vestigial wings, red eyes

10

b

vg+

bw

Black body, normal wings, brown eyes

13

1a)Which combinations of phenotypes are only possible in those offspring derived from gametes resulting from double crossover events?

_________________________________________________________________________________________

1b)What is the distance between the body color (gray vs. black) and wing loci (normal vs. vestigial)?

1c)What is the distance between the body color (gray vs. black) and eye color loci (red vs. brown eyes)?

1d)What is the coefficient of coincidence for double crossovers?

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