A human female with Turner syndrome also expresses the X-linked recessive hemoph
ID: 317489 • Letter: A
Question
A human female with Turner syndrome also expresses the X-linked recessive hemophilia trait, as did her father. Which of her parents underwent non-disjunction during meiosis to give rise to the gamete responsible for the syndrome. Diagram your answer. A couple planning their family are aware that there has been a high incidence of stillbirths and children born with developmental abnormalities on the husband's side of the family. A karyotype analysis of the father shows a normal complement of 46 chromosomes, but one of the chromosomes contains an inversion covering 70% of its length. What is the probability that the couple will have a child with no developmental abnormalities?Explanation / Answer
A human female with Turner syndrome expresses the X-linked trait hemophilia as did her father. Which of her parents underwent non disjunction during meiosis, giving rise to the gamete responsible for the syndrome?
Answer =. her mother
Turner syndrome-genotype-------45,XO
For expression haemophilia, one X-linked recessive allele is enough for expression in males.
For expression haemophilia, TWO X-linked recessive allele is required for expression in females.
Turner syndrome genotype = XhO
Xh
O
Xh RECEIVED FROM FATHER
O RECEIVED FROM MOTHER DUE TO disjunction
XhO
Xh
O
Xh RECEIVED FROM FATHER
O RECEIVED FROM MOTHER DUE TO disjunction
XhO
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