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?

Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
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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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