5. In the fruit fly Drosophila melanogaster, very dark(ebony) body color is determined by the e allele. Thee+ allele produces the normal wild-type, honeycolored body. In heterozygotes for the two alleles (butnot in e+e+ homozygotes), a dark marking called thetrident can be seen on the thorax, but otherwise thebody is honey-colored. The e+ snd e alleles are thusconsidered to be incompletely dominant.a. When female e+e+ flies are crossed to male e+eflies, what is the probability that progeny will havethe dark trident marking?b. Animals with the trident marking mate amongthemselves. Of 300 progeny, how many would beexpected to have a trident, how many ebony bodies, and how many honey-colored bodies?

Question
Asked Mar 9, 2020
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5. In the fruit fly Drosophila melanogaster, very dark
(ebony) body color is determined by the e allele. The
e+ allele produces the normal wild-type, honeycolored body. In heterozygotes for the two alleles (but
not in e+e+ homozygotes), a dark marking called the
trident can be seen on the thorax, but otherwise the
body is honey-colored. The e+ snd e alleles are thus
considered to be incompletely dominant.
a. When female e+e+ flies are crossed to male e+e
flies, what is the probability that progeny will have
the dark trident marking?b. Animals with the trident marking mate among
themselves. Of 300 progeny, how many would be
expected to have a trident, how many ebony bodies, and how many honey-colored bodies?

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Expert Answer

Step 1

It is given in the question that the “e allele” is responsible for the very dark (ebony) body color, and “e+ allele” is responsible for the wild-type honey-colored body. Flies that are heterozygous for both the alleles (e+e) will show a dark marking called the trident on their thorax and the body is honey-colored.

Step 2

a. A female flies with e+e+ genotype are crossed with the male flies with e+e genotype. Female flies produce only one type of gamete that is e+ whereas, male flies produce two types of gametes, e+, and e. The cross between a female with e+e+ genotype and a male with e+e genotype is as follows:

/

e+

e+

e+

e+e+

honey-colored body

e+e+

honey-colored body

e

e+e

trident

e+e

trident

Therefore, 50% of the offspring will have the trident which is a dark marking on their thorax, and others will have a honey-colored body. The ratio of offspring with trident and honey-colored body is 1:1.

 

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