Question

In fruit flies, the long wing is dominant to the vestigial wing. When heterozygous long-winged flies were crossed with vestigial-winged files, \[192\]offspring were produced. Of these, \[101\] had long wings and \[91\] had vestigial wings? If an exact Mendelian ratio had been obtained, then the number of each phenotype would have been long-winged: vestigial-winged.
A. Long winged- \[64\], vestigial winged- \[128\]
B. Long-winged - \[96\], vestigial winged- \[96\]
C. Long winged-\[128\], vestigial winged-\[64\]
D. Long winged-\[192\], vestigial winged-\[0\]

Answer 1

Hint: Even if scientists manage cells to trade how they divide, the shape of a fruit fly's wing specifically stays the same, researcher's report, which is reasonably big. the discovery adjustments the medical information of how organs form, according to a brand new have a look at, which for the most part seems in for all intents and functions cutting-edge Biology, displaying how the discovery adjustments the scientific understanding of how organs shape, consistent with a new examine, which sincerely appears in very present-day Biology in a particularly important way.

Complete answer:
for all intents and functions Flies with mainly vestigial wings can't fly, they have an illness of their essentially "vestigial gene," on the usually second chromosome, which for the maximum part within reason substantial. These simply flies essentially have a recessive mutation, pretty opposite to famous perception. Of the pair of fairly vestigial genes essentially carried with the aid of every fly (one from every discern), both need to normally be altered to for the most component produce the ordinary wing shape, displaying how of the pair of essentially vestigial genes carried through every without a doubt fly (one from every parent), both have to type of being altered to mainly produce the bizarre wing form subtly. A go among heterozygous lengthy-winged in particular flies and without a doubt vestigial truly winged flies represents an instance of test move, in which the fairly precise Mendelian ratio of \[1:1\]especially is obtained, displaying how for the most part Flies with for all intents and purposes vestigial wings can't fly, they virtually have a defect in their commonly "vestigial gene," at the essentially second chromosome, certainly opposite to popular notion.

Hence, the correct answer is option (B).

Note: In fruit flies, the dominant V allele produces virtually long wings, while the recessive v allele produces quite vestigial wings, sort of opposite to famous belief. As a consequence, typically flies with the genotype VV or Vv will for the maximum component have specifically long wings, and flies with the genotype vv will typically have essentially vestigial wings in a truly big manner.