Question 26 In which of the following individuals would you expect to find two B
ID: 203888 • Letter: Q
Question
Question 26
In which of the following individuals would you expect to find two Barr bodies in their somatic cells?
XX
XO
XXY
XXYY
XXX
1 points
Question 27
A female is heterozygous for the recessive X-linked gene for Lesch-Nyhan syndrome. What proporation of her daughters will be carriers for the trait if their father is not affected?
0%
25%
50%
75%
100%
1 points
Question 28
When studying a new disease you discover that the gene responsible is linked to the X chromosome. Which of the following is FALSE?
It can be passed from father to son.
It can be passed from mother to son.
It can be passed from mother to daughter.
It can be passed from father to daughter.
All of the above are possible.
1 points
Question 29
What is the role of the pseudoautosomal region on the X and Y chromosomes?
It allows the levels of expresion on the X chromosomes to be equalized between males and female.
Allows the X and Y chromosomes to pair during meiosis.
Contains the SRY gene on the X and Y chromosomes.
Determines if the male phenotype will be expressed.
All of the above are correct.
XX
XO
XXY
XXYY
XXX
Explanation / Answer
Question 26
In which of the following individuals would you expect to find two Barr bodies in their somatic cells?
E) XXX
Question 27
A female is heterozygous for the recessive X-linked gene for Lesch-Nyhan syndrome. What proporation of her daughters will be carriers for the trait if their father is not affected?
C) 50%
Question 28
When studying a new disease you discover that the gene responsible is linked to the X chromosome. Which of the following is FALSE?
A) It can be passed from father to son.
Question 29
What is the role of the pseudoautosomal region on the X and Y chromosomes?
B) Allows the X and Y chromosomes to pair during meiosis
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