Something derived from another
One descended directly from the same parents or ancestors
It's a descendant of the Mexican earless goat.
His mother was a descendant of the celebrated John Cotton.
He was a descendant of Thomas Webster, of Scottish ancestry, who settled in New Hampshire about 1636.
His descendant, Sir Robert Spencer, the 1st baron, was in 1603, "reputed to have by him the most money of any person in the kingdom."
Half the rice grown in California is a descendant of Calrose 76, created when gamma rays mutated some regular rice and the resulting mutant produced more grain and less spoilage.