Table 8.1 shows that Turner syndrome occurs when an individual inherits one X chromosome but lacks a second sex chromosome. Can Turner syndrome be due to nondisjunction during oogenesis, spermatogenesis, or both? If a phenotypically normal couple has a color-blind child (due to a recessive X-linked allele) with Turner syndrome, did nondisjunction occur duringoogenesis or spermatogenesis in this child’s parents? Explain your answer. TABLE 8.1Aneuplold Conditions In HumansConditionFrequencySyndromeCharacteristicsAutosomalMental and physicaldeficiencies, wide varietyof defects in organs, largetriangular nose, early deathTrisomy 131/15,000PatauTrisomy 18Mental and physicaldeficiencies, facialabnormalities, extreme muscletone, early death1/6000EdwardTrisomy 211/800DownMental deficiencies, abnormalpattern of palm creases,slanted eyes, flattened face,short statureSex ChromosomalKlinefelterSexual immaturity (no sperm),breast swelling (males)XXY1/1000XYYV1000JacobsTall and thin (males)XXX1500Triple XTall and thin, menstrualirregularity (females)Short stature, webbedneck, sexually undeveloped(females)15000Turner

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Description: Table 8.1 shows that Turner syndrome occurs when an individual inherits one X chromosome but lacks a second sex chromosome. Can Turner syndrome be due to nondisjunction during oogenesis, spermatogenesis, or both? If a phenotypically normal couple has

Chromosomal deletion syndrome occurs when whole or part of chromosomes are missing. Turner Syndrome…

Answered: TABLE 8.1 Aneuplold Conditions In…

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Chapter1: The Human Body: An Orientation

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Table 8.1 shows that Turner syndrome occurs when an individual inherits one X chromosome but lacks a second sex chromosome. Can Turner syndrome be due to nondisjunction during oogenesis, spermatogenesis, or both? If a phenotypically normal couple has a color-blind child (due to a recessive X-linked allele) with Turner syndrome, did nondisjunction occur during
oogenesis or spermatogenesis in this child’s parents? Explain your answer.

TABLE 8.1
Aneuplold Conditions In Humans
Condition
Frequency
Syndrome
Characteristics
Autosomal
Mental and physical
deficiencies, wide variety
of defects in organs, large
triangular nose, early death
Trisomy 13
1/15,000
Patau
Trisomy 18
Mental and physical
deficiencies, facial
abnormalities, extreme muscle
tone, early death
1/6000
Edward
Trisomy 21
1/800
Down
Mental deficiencies, abnormal
pattern of palm creases,
slanted eyes, flattened face,
short stature
Sex Chromosomal
Klinefelter
Sexual immaturity (no sperm),
breast swelling (males)
XXY
1/1000
XYY
V1000
Jacobs
Tall and thin (males)
XXX
1500
Triple X
Tall and thin, menstrual
irregularity (females)
Short stature, webbed
neck, sexually undeveloped
(females)
15000
Turner

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