Which of the following statements correctly describes the Chromosomal Theory of Inheritance? Select one: a. Homologous chromosomes separate independently during meiosis. b. Each person has two copies of the factors that determine our traits. c. X and Y chromosomes determine whether an individual is genetically male or female. d. The factors that determine our traits are found on chromosomes.

What must be true about the genotypes of parents who have a child who has an: a. dominant trait? b. recessive trait?

Which statement about the pattern of inheritance for a recessive X-linked allele is true? A. Unaffected parents can produce daughters who are affected. B. Unaffected parents can have sons who are affected and daughters who are carriers. C. Unaffected fathers can be carriers. D. Affected parents do not produce affected children. E. Every affected person has an affected parent.

Marfan’s syndrome is a disorder of the fibrous connective tissue, characterized by many symptoms, includinglong, thin digits; eye defects; heart disease; and long limbs. (Flo Hyman, the American volleyball star, suf-fered from Marfan’s syndrome. She died from a ruptured aorta.) a. Use the pedigree above to propose a mode of in-heritance for Marfan’s syndrome. b. What genetic phenomenon is shown by this pedigree?c. Speculate on a reason for such a phenomenon.