B. Gene. Piebalding is caused by mutant copies of genes.
Andrew Jackson was a man who work very hard at his adulthood and became rich due to his hard efforts
he was inherited with wealth ,he was very humble person and was born poor and was a common man
so correct option is D hope it helps<span />
I believe it’s B sorry if it’s wrong
The percentage of alleles for homozygous recessive would be 50%