18 Questions
What is the probability that sons of an affected man and a carrier mother will be affected by an X-linked recessive disease?
50%
Which of the following is NOT an X-linked recessive disease?
Marfan syndrome
If a daughter of an affected man inherits his mutated X chromosome, what is the potential outcome?
She will be a carrier.
Which of the following diseases exhibits X-linked recessive inheritance?
Duchenne muscular dystrophy
What is the probability that sons of an affected man and an affected mother will be affected by an X-linked recessive disease?
100%
How do daughters of an affected man and carrier mother differ in their outcomes in X-linked recessive inheritance?
Some are carriers and some are affected.
Why can affected fathers not pass X-linked recessive traits to their sons?
Because fathers give Y chromosomes to their sons
Why are X-linked recessive traits more commonly expressed in males than in females?
Males possess only one X chromosome
What happens when a female is a carrier for an X-linked recessive disorder?
She will not pass the disorder to her sons
Why does male-to-male transmission of X-linked recessive traits not occur?
Fathers give Y chromosomes to their sons
How many mutated X chromosomes do females need to be affected by an X-linked recessive trait?
Two
Why are males who inherit an affected X chromosome from their mother more likely to exhibit X-linked recessive traits?
Because they lack a second X chromosome to compensate for the mutation
What is true about X-linked dominant inheritance?
One copy of the allele is sufficient to cause the disorder
Which of the following statements is correct regarding X-linked dominant inheritance?
Mothers with the trait will always have affected daughters
In X-linked dominant inheritance, if the father is affected by a disorder, which offspring will be affected?
Only daughters
What happens if a mother with an X-linked dominant disorder has a son?
The son will always be affected
Which of the following is NOT a characteristic of X-linked dominant inheritance?
Affects more females than males
In X-linked dominant inheritance, what is the inheritance pattern when both parents have the disorder?
Sons have a chance to be affected depending on the type of X chromosome inherited
Test your knowledge on diseases with X-linked dominant and recessive inheritance patterns, including Goltz syndrome, Incontinentia pigmenti, Rett syndrome, and more. Learn about the principles of X-linked recessive inheritance and how it affects males and females.
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