In fruit flies, straight wings are dominant and curly wings are recessive. Assuming that Mendel’s method of crossing two true-breeding parents with opposite traits is followed, the generations will look as follows: The P generation has straight wings and curly wings. The F1 generation has all straight wings. The F2 generation has straight wings and curly wings.
From the given information, let us assume the following;
- the traits of the dominant straight wings = WW
- the traits of the recessive curly wings = ww
The Parent generation according to Mendel’s method of crossing two true-breeding parents with opposite traits.
P generation: = WW × ww
i.e.
- The P generation has straight wings and curly wings.
Now, if the parent generation crosses to produce the first filial generation (F1 generation).
Then the punnet cross can be well represented as:
W W
w Ww Ww
w Ww Ww
Therefore, the first filial generation F1 are all heterozygous for Straight wings. i.e.
- The F1 generation has all straight wings.
If the traits of the first filial generation cross each other, we can determine the traits of the second filial generation.
Now; the gametes going into production of the F2 generation are:
Ww × Ww
W w W w
W WW Ww WW Ww
w Ww ww Ww ww
W WW Ww WW Ww
w Ww ww Ww ww
Thus, the traits of the offspring comprised of 12 straight wings and curly wings phenotypically.
Therefore, we can conclude that the P generation has straight wings and curly wings. The F1 generation has all straight wings. The F2 generation has straight wings and curly wings.
Learn more about Mendel's theory here:
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