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a scientist is studying fruit fly wings. straight wings are dominant, curly wings are recessive. which statement correctly describes the f1 generation of a straight-winged parent is crossed with a curly winged parent and if both parents are true breeding?

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gennywoah
Wouldn't the straight wings be more of the outcome sense those are dominant and only a few outcomes as in F2 g. be curly sense those are recessive.
midknight9

If both parents are true breeding, they have two of the same allele and are homozygous.


Let's use S for the dominant allele and s for the recessive allele. We will end up with the following combinations:


[tex] \left[\begin{array}{ccc}&S&S\\s&Ss&Ss\\s&Ss&Ss\end{array}\right] [/tex]


As you can see from the cross above, all of the offspring will be heterozygous for this allele. Therefore, all of the offspring will display the dominant phenotype (straight-winged).

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