1. Tardigrade
  2. Question
  3. Biology
  4. In fruit flies, long wing is dominant to vestigial wing. When heterozygous long-winged flies were crossed with vestigial-winged flies, 192 offsprings were produced. If an exact Mendelian ratio had been obtained, then the number of each phenotype would have been Long-winged Vestigial-winged (a) 64 128 (b) 96 96 (c) 128 64 (d) 192 0

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Q. In fruit flies, long wing is dominant to vestigial wing. When heterozygous long-winged flies were crossed with vestigial-winged flies, $192$ offsprings were produced. If an exact Mendelian ratio had been obtained, then the number of each phenotype would have been
Long-winged$\,\,$ Vestigial-winged
(a)$\,\,$ $64\,\,$ $128$
(b)$\,\,$ $96\,\,$ $96$
(c)$\,\,$ $128\,\,$ $64$
(d)$\,\,$ $192\,\,$ $0$

Principles of Inheritance and Variation

Solution:

A cross between heterozygous long-winged flies and (homozygous) vestigial winged flies represents an example of test cross, in which the exact Mendelian ratio of $1 : 1$ is obtained, i.e. $96$ long-winged flies and $96$ vestigial winged flies.