Which of the following most appropriately describes haemophilia?
1. X-linked recessive gene disorder
2. Chromosomal disorder
3. Dominant gene disorder
4. Recessive gene disorder
1. | Mutations destroy telomerase inhibitor |
2. | Mutations inactivate the cell control |
3. | Mutations inhibit the production of telomerase |
4. | Mutations in proto–oncogenes accelerate the cell cycle |
Match the terms in Column I with their description in Column II and choose the correct option.
Column I | Column II | ||
A. | Dominance | 1. | Many govern a single character |
B. | Codominance | 2. | In a heterozygous organism, only one allele expresses itself |
C. | Pleiotropy | 3. | In a heterozygous organism, both alleles express themselves fully |
D. | Polygenic inheritance | 4. | A single gene influences many characters |
A | B | C | D | |
1. | 2 | 3 | 4 | 1 |
2. | 4 | 1 | 2 | 3 |
3. | 4 | 3 | 1 | 2 |
4. | 2 | 1 | 4 | 3 |
1. | chromosomes failed to separate during meiosis |
2. | the two genes are linked and present on the same chromosome |
3. | both of the characters are controlled by more than one gene |
4. | the two genes are located on two different chromosomes |
I: | Haemophilia is a sex-linked recessive disease. |
II: | Down’s syndrome is due to aneuploidy. |
III: | Phenylketonuria is an autosomal recessive gene disorder. |
IV: | Sickle cell anaemia is an X-linked recessive gene disorder |
Which one from those given below is the period for Mendel's hybridization experiments?
1. | 1840-1850 | 2. | 1857-1869 |
3. | 1870-1877 | 4. | 1856-1863 |
If a colourblind man marries a woman who is homozygous for normal colour vision, the probability of their son being colourblind is:
1. 0
2. 0.5
3. 0. 75
4. 1
A woman has an X-linked condition on one of her X chromosomes. This chromosome can be inherited by:
1. | Only daughters | 2. | Only sons |
3. | Only grandchildren | 4. | Both sons and daughters |
Which of the following characteristics represent the 'Inheritance of blood groups' in humans?
a. Dominance
b. Co-dominance
c. Multiple allelism
d. Incomplete dominance
e. Polygenic inheritance
1. | b, c, and e | 2. | a, b and c |
3. | b, d, and e | 4. | a, c, and e |