A 20-year-old woman was examined for infertility. She was short (150 cm), had infantile genitalia, had no pubic hair, and never had menstruated. She showed webbing of the neck, had cubitus valgus, and widely spaced nipples
X-chromosome mosaicism was found during the cytogenetic examination. This chromosomal anomaly is a consequence of
A. nondisjunction during second meiotic division of the ovum
B. nondisjunction during first meiotic division of the ovum
C. nondisjunction during spermatogenesis
D. nondisjunction during mitotic division in early embryogenesis
E. polyspermia
D
This woman has Turner's syndrome, which most often occurs with a 45, X karyotype. The missing X chromosome in these cases is deleted by nondisjunction during meiosis. A significant number of Turner's syndrome patients have mosaicism, which results from mitotic errors during early embryogenesis.
You might also like to view...
The male gametes are:
A. bulbourethral glands B. seminal vesicles C. spermatozoa D. testes
Men are more likely to die from a heart attack than women.
Answer the following statement true (T) or false (F)
Which one of the four premises below applies to using control groups in social program evaluation?
A) Individuals should not be restricted to the status-quo B) Individuals should not be informed of the purpose in order to avoid bias C) Individuals should be informed when they will be subjected to ineffective or harmful programs D) Individuals have a right to new services, and random selection gives all a chance to participate
Yuna has suffered from PMS for years but doesn't want to take the oral contraceptive her doctor recommended she try. Wary of medications and of taking too many supplements, Yuna has decided to try increasing her daily physical activity and altering her diet to see if she can improve her symptoms. Which of the following dietary modifications is most likely to relieve her symptoms?
A. drinking less water so less can be retained to cause bloating B. eating more calcium-rich foods like fat-free yogurt and leafy green vegetables C. eating salted nuts because they are high in sodium D. drinking more alcohol to numb the pain