Sex-Linked Inheritance
Biology ⇒ Genetics and Heredity
Sex-Linked Inheritance starts at 10 and continues till grade 12.
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See sample questions for grade 12
A color-blind woman (XᶜXᶜ) marries a man with normal vision (XᴺY). What is the expected phenotype of their daughters?
A man with hemophilia (XʰY) marries a woman who is not a carrier (XᴴXᴴ). What is the probability that their children will have hemophilia?
A pedigree shows that a trait is only present in males and is passed from father to all sons. What type of inheritance is this?
A woman with hemophilia (XʰXʰ) marries a man with normal blood clotting (XᴴY). What is the expected phenotype of their children?
A color-blind woman (XᶜXᶜ) marries a man with normal vision (XᴺY). What is the expected phenotype of their daughters?
A man with hemophilia (XʰY) marries a woman who is not a carrier (XᴴXᴴ). What is the probability that their children will have hemophilia?
A man with normal vision (XᴺY) and a woman who is a carrier for color blindness (XᴺXᶜ) have a son. What is the probability that the son will be color-blind?
A pedigree shows that a trait is only present in males and is passed from father to all sons. What type of inheritance is this?
Which of the following best describes a carrier female for an X-linked recessive disorder?
(1) She expresses the disorder
(2) She has one normal and one mutant allele
(3) She has two mutant alleles
(4) She cannot pass the disorder to her children
Which of the following best describes the inheritance of X-linked traits in fruit flies (Drosophila melanogaster)?
(1) Males inherit X-linked traits from their fathers
(2) Females inherit X-linked traits only from their mothers
(3) Males inherit X-linked traits from their mothers
(4) X-linked traits are not present in fruit flies
Which of the following best explains why X-linked dominant disorders are more severe in males?
(1) Males have two X chromosomes
(2) Males have only one X chromosome
(3) Males have no X chromosome
(4) Males have two Y chromosomes
Which of the following genotypes represents a female carrier for an X-linked recessive trait?
(1) XᴬXᴬ
(2) XᴬXᵃ
(3) XᵃXᵃ
(4) XᴬY
Fill in the blank: In humans, the presence of a ______ chromosome determines maleness.
Fill in the blank: The process by which one of the X chromosomes in females is randomly inactivated is called ______.
Fill in the blank: The SRY gene, which determines male development, is located on the ______ chromosome.
Fill in the blank: The visible condensed structure of an inactivated X chromosome in female cells is called a ______.
True or False: A female with two X-linked recessive alleles will express the disorder.
True or False: All sons of a woman with an X-linked dominant disorder will inherit the disorder.
True or False: Males are more likely to express X-linked recessive traits than females.
True or False: X-linked dominant traits can be lethal in males.
