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QuizMultiple Choice
Unit Test
Question 1 of 14 • 25-26 Summer - Humble ISD CR - Biology A - 2nd Nine Weeks
Pedigrees are used to help geneticists understand how traits are inherited between generations. The Romanovs, a Russian royal family, had a history of hemophilia, a sex-linked disorder that is determined by a recessive allele on the X chromosome.What is the best evidence to prove that Irene was heterozygous for hemophilia?
Answer
A
Elizabeth is not a carrier for the trait.B
Tatiana carried the recessive allele.C
Her brother has hemophilia and her sister is a carrier.D
Two of her sons have hemophilia and one does not.