_____ are modifications that make organisms suited to their way of life
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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:
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).