In Phenylketonuria,
I. | Phenylpyruvic acid and other derivatives are accumulated in the brain resulting in mental retardation. |
II. | These are also excreted through urine because of their poor absorption by the kidney. |
1. | Only I is correct | 2. | Only II is correct |
3. | Both are correct | 4. | Both are incorrect |
The F1 progeny in monohybrid crosses by Mendel resembled:
1. | The parent exhibiting the dominant trait completely |
2. | The parent exhibiting recessive trait comp |
3. | The parent exhibiting the dominant trait partly |
4. | The parent exhibiting recessive traits partly |
Failure of cytokinesis after telophase stage of cell division results in an increase in a whole set of chromosomes in an organism and this phenomenon is known as:
1. | Aneuploidy | 2. | Translocation |
3. | Polyploidy | 4. | Inversion |
Which of the following is not true for the Law of Dominance given by Mendel?
1. | Characters are controlled by discrete units called factors. |
2. | Factors occur in pairs. |
3. | In a dissimilar pair of factors, one member of the pair dominates the other. |
4. | The alleles show blending at the time of fertilization. |
An individual affected by Klinefelter’s syndrome:
1. | Has 47 autosomes. |
2. | Has overall feminine development. |
3. | Has gynecomastia. |
4. | Has an additional copy of the Y chromosome. |
An individual affected with Turner’s Syndrome:
I: | Is a female |
II: | Has 45 chromosomes |
III: | Has rudimentary ovaries |
Of the above statements, the correct statements are:
1. | Only I and II | 2. | Only I and III |
3. | Only II and III | 4. | I, II and III |
In the case of co-dominance, the F1 generation resembles:
1. | Dominant parent | 2. | Recessive parent |
3. | Both the parents | 4. | None of the parents |
Genes that code for a pair of contrasting traits or slightly different forms of the same gene are known as:
1. | Alleles | 2. | Loci |
3. | Cistrons | 4. | Introns |
What is the mode of inheritance of phenylketonuria?
1. | Autosomal recessive | 2. | Autosomal dominant |
3. | Sex linked recessive | 4. | Sex linked dominant |
Which of the following is not a feature of Down’s Syndrome?
1. | It is caused by a non-disjunction in an autosome. |
2. | The affected individual has a trisomy of chromosome 21. |
3. | The affected individual has a characteristic simian palmar crease. |
4. | The mental development of the affected individual is normal. |