DS is working on a "Martian Genotypes" assignment for science, using Punnett squares. A question asks, "two Martians who are both heterozygous for fingers marry and have four children. What percent of their children will have three fingers and what percent will have two?" (Three is dominant)
So: FF, Ff, Ff, ff.

I have had him write a disclaimer on his answer, explaining that while there is a 75% chance of any child having three fingers and a 25% chance of any child having two, that is NOT the same thing as "75% of their children will have three fingers". They could all have three, or all have two. Grr. And there is another question that does the same thing, incorrectly.

To mix it up, there are other questions worded that way which are correct, such as the one where 100% of the children will have two antennae because one parent is homozygous dominant and the other is homozygous recessive.