PATHOLOGY

PATHOLOGY MCQ

GENETICS AND DISEASE

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
A person with Turner syndrome has only one X chromosome. This means one of their gametes was missing a chromosome. Which of the following is why gametes sometimes lack a complete chromosome?
A
Incomplete dominance
B
Nondisjunction
C
Inversion mutation
D
Substitution mutation
Explanation: 

Detailed explanation-1: -About half of individuals with Turner syndrome have monosomy X, which means each cell in the individual’s body has only one copy of the X chromosome instead of the usual two sex chromosomes. Turner syndrome can also occur if one of the sex chromosomes is partially missing or rearranged rather than completely absent.

Detailed explanation-2: -Turner syndrome, a condition that affects only females, results when one of the X chromosomes (sex chromosomes) is missing or partially missing. Turner syndrome can cause a variety of medical and developmental problems, including short height, failure of the ovaries to develop and heart defects.

Detailed explanation-3: -A girl with Turner syndrome only has 1 normal X sex chromosome, rather than the usual 2. This chromosome variation happens randomly when the baby is conceived in the womb. It is not linked to the mother’s age. Read more about the genetic cause of Turner syndrome.

Detailed explanation-4: -Turner syndrome (TS) is a genetic disorder caused by the partial or complete absence of one X chromosome. This is called monosomy and is typically caused by chromosomal nondisjunction. It is a very common abnormality among the sex chromosome disorders, with an incidence of 1 in 2000 liveborn females.

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