PATHOLOGY MCQ
GENETICS AND DISEASE
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
Which is TRUE about sex-linked traits?
|
|
In humans, they are more likely to be found in females because the X chromosome is shorter than the Y chromosome.
|
|
|
They are found in equal numbers among male and females because the different sizes of sex chromosomes have no effect on the expression of the traits.
|
|
|
A girl must inherit 2 recessive traits on her X chromosome to show the phenotype, while a boy must only inherit 1 recessive trait on his X chromosome to show the phenotype.
|
|
|
One cannot determine whether a female has a sex-linked trait or not.
|
Explanation:
Detailed explanation-1: -If a daughter expresses an X-linked recessive gene, she probably inherited the trait from: both parents. Why do X-linked conditions appear more frequently in males than in females?
Detailed explanation-2: -Recessive X-linked traits appear more often in males than females because, if a male receives a “bad” allele from his mother, he has no chance of getting a “good” allele from his father (who provides a Y) to hide the bad one.
There is 1 question to complete.