In fruit flies, normal sized wings(R) are dominant over tiny wings(r). A biologi
ID: 61890 • Letter: I
Question
In fruit flies, normal sized wings(R) are dominant over tiny wings(r). A biologist has a genetically uniform population of flies that have normal wings a genetically uniform population of flies that have tiny wings. He wants to find out whether the population of normal winged flies is heterozygous. ? Identify two genetic crosses that the biologist want to show that the normal-winged flies are heterozygous. ? Predict the percentage of offspring expected of offspring with each wing type. If the normal winged flies are heterozygous for each genetic cross.Explanation / Answer
Normal wings RR, tiny wings rr.
To know whether the normal winged flies are heterozygous, the normal winged files are heterozygous, they have to be crossed with the homozygous recessive parent. if they are heterozygous the offspring will have 1:1 segregation for normal : tiny winged fiels
Rr * rr = Rr : rr 1:1
if the normal winged files are homozygous dominant, the offsprings will have 3:1 for normal : tiny winged animals.
RR * rr = RR: Rr : rr = 3: 1 (1:2:1)= normal : tiny winged animals