Distinguish between Klinefelter syndrome and Turner syndrome.
What will be an ideal response?
Answers will vary. Approximately 1 male in 500 has Klinefelter syndrome, which is caused by an extra X sex chromosome (an XXY sex chromosomal pattern). XXY males produce less of the male sex hormone testosterone than normal males. As a result, male primary and secondary sex characteristics- such as the testes, deepening of the voice, musculature, and the male pattern of body hair-do not develop properly. XXY males usually have enlarged breasts (gynecomastia) and are usually mildly mentally retarded, particularly in language skills. XXY males are typically treated with testosterone replacement therapy, which can foster growth of sex characteristics and elevate the mood, but they remain infertile.Approximately 1 girl in 2,500 has a single X sex chromosome and as a result develops Turner syndrome. The external genitals of such girls are normal, but their ovaries are poorly developed and they produce little estrogen. Girls with this problem are shorter than average and infertile. Researchers have connected a specific pattern of cognitive deficits with low estrogen levels: problems in visual-spatial skills, mathematics, and nonverbal memory.
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a) True b) False
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