2. (5 points) In the fruitfly, very dark (ebony) body color is determined by the
ID: 268240 • Letter: 2
Question
2. (5 points) In the fruitfly, very dark (ebony) body color is determined by the recessive e allele. Th e+ allel e produces a normal, wild-type, honey colored body. In heterozygotes, a dark marking led a trident can be seen on the thorax of the body but otherwise the body is honey-colored. a. What kind of inheritance would produce this trident marking? b. When female es e flies are crossed to male ere files, what is the probability that the progeny will have the trident marking? A second gene D, when homozygous recessive, can produce a white colored trident marking in those flies capable of making a trident marking. When two heterozygotes for these two genes are crossed, how many white trident flies are produced? How many of the resulting flies would have a dark trident marking? c. d.Explanation / Answer
Multiple inheritance would produce this trident marking
when female e+e+ flies are crossed to make e+e flies 50 % is the probability that the progeny will have the trident marking
parent: e+e+ e+e
Genotype: e+ e+ e+ e
Offspring : e+e+ , e+e , e+e+, e+e
A second gene D, when homozygous recessive, can produce a white coloured trident marking in those flies capable of marking. when two heterozygous for these two genes are crossed 25% white trident flies are produced
parent: Dd Dd
Genotype: D d D d
Offspring : DD , Dd , Dd, dd
75% of the resutling flies would have a dark trident marking.
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