Mental retardation in man occurs due to:
1. Loss of one X chromosome
2. Addition of one X chromosome
3. Slight growth in Y
4. Overgrowth in Y
Consider the following statements:
I: | People affected by phenylketonuria are unable to convert tyrosine to phenylalanine. |
II: | Alzheimer’s disease results from the accumulation of amyloid protein plaques in the brain. |
III: | Klinefelter’s and Turner’s syndromes are the result of nondisjunction of the sex chromosomes in either of the sexes. |
Which of the above statements are true?
1. | I and II only | 2. | I and III only |
3. | II and III only | 4. | I, II, and III |
Which of the following would not be a feature seen in a patient with the following karyotype?
1. Many loops on fingertips
2. Congenital heart disease
3. Big and wrinkled tongue
4. Mucus clogging of airways
Nondisjunction of a pair of homologous chromosomes occurs during the anaphase of meiosis I. The four gametes produced as a result of this nondisjunction event will be:
1. | n + 1; n + 1; n - 1; n - 1 | 2. | n + 1; n - 1; n; n |
3. | n + 1; n - 1; n - 1; n - 1 | 4. | n + 1; n + 1; n; n |
Conditions of a karyotype 2n +1, 2n –1 and 2n + 2, 2n – 2 are called:
1. | Aneuploidy | 2. | Polyploidy |
3. | Allopolyploidy | 4. | Monosomy |