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1 answer:

3 0

The answer is <span>0%.
</span>
Cystic fibrosis is a recessive gene disorder so it needs two defective genes to make the disease expressed. In this case, a half shaded circle(heterozygote female) is mate with an <span>unshaded square( homozygote dominant male).
The offspring produced should be: 50% </span>heterozygote, 50% homozygote dominant.
Both homozygote dominant and heterozygote will not express the disease, so 100% of the offspring will be healthy.

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