Question

In the fruit fly, normal wings (W) is dominant over the vestigial wings (w). On the crossing of two normal-winged flies, 76 normal winged and 23 vestigial winged Offsprings are produced. Which of the following would be the possible genotype of parents?
A) WW and ww
B) WW and Ww
C) Ww and ww
D) Ww and Ww
E) WW and WW

Answer 1

The mechanism of obtaining genetic information from the parent of an offspring is called inheritance. The legacy relies on the parent inheritance of characteristics or characters. Genotype refers to the genetic makeup of an organism.

Complete answer: Owing to inheritance, members of the same family exhibit identical characteristics. By carrying out experiments using the Pisum sativum plant, Gregor John Mendel derived the concepts of Mendelian inheritance. While performing the experiment, he considered 7 characteristics of which, one of the characteristics was the position of the flower, which is an axial position (A), which is considered dominant, and the terminal position (a) is considered recessive. In the above question, to generate 76 normal winged flies and 23 vestigial winged progenies, two normal winged flies are crossed. Two regular flies on the wing indicate either Ww or WW. However, the ratio given in the question shows that more normal wing flies. So the cross between a pair of Ww and Ww will result in a phenotype of 3/4 normal winged and 1/4 vestigial wings. Therefore, the possible genotype of parents who are normally winged Ww and Ww.
So, option D is the correct answer.

Note: Depending upon the genotype, the phenotype refers to the external appearance of an organism. A monohybrid cross is defined by the above cross. The F1 progeny phenotype developed in the monohybrid cross is always in the 3:1 ratio.