बहुजीनों या मात्रात्मक लक्षणों की वंशागति को क्या कहा जाता है?

A phenotypically normal woman gives birth to two sons with an X-linked recessive disorder and one normal son. What is the probability that her next son will have the disorder?

A plant heterozygous for two traits (TtRr) is test-crossed with a homozygous recessive plant (ttrr). Assuming independent assortment, what proportion of offspring will show both dominant phenotypes?