create a punnett square crossing one person who has square palms (a) with someone who is heterozygous for palm size(Aa).
What are the genotypes(ratios)
Draw the phenotype
Assuming that A is dominant and a is recessive, the mating of the two individuals (genotypes aa and Aa), would be 50% of each of the following genotypes: Aa and aa. All the children receive the recessive a from the aa parent, while half receive the dominant A from the other parent.
Unfortunately, I don't know what a square palm looks like. Have you consulted your textbook?
I hope this helps a little more. Thanks for asking.