In a cross between a male and female, both heterozygous for sickle cell anaemia gene, what percentage of the progeny will be diseased?
1.
25%
2.
100%
3.
50%
4.
75%
Study the pedigree chart of a certain family given below and select the correct conclusion which can be drawn for the character:
| 1. | The parents could not have had a normal daughter for this character |
| 2. | The trait under study could not be colourblindness |
| 3. | The male parent is homozygous dominant |
| 4. | The female parent is heterozygous |
Represented below is the inheritance pattern of a certain type of traits in humans. Which one of the following conditions could be an example of this pattern?
| 1. | Sickle cell anemia | 2. | Haemophilia |  |
| 3. | Thalassemia | 4. | Phenylketonuria |
The best example of pleiotropy is:
1. Skin color
2. Phenylketonuria
3. Colour Blindness
4. ABO Blood group
The number of contrasting characters studied by Mendel for his experiments was:
| 1. | 14 | 2. | 4 |
| 3. | 2 | 4. | 7 |
Chromosomal theory of inheritance was proposed by:
1. Sutton and Boveri
2. Bateson and Punnet
3. T. H. Morgan
4. Watson and Crick
| 1. | It is also known as trisomy 21 |
| 2. | The parents of the affected individual are usually affected from the disorder. |
| 3. | There is no cure for Down syndrome. |
| 4. | The extra chromosome 21 material may also occur due to a Robertsonian translocation in 2–4% of cases. |
| 1. | Autosomal recessive | 2. | Autosomal dominant |
| 3. | Sex-linked recessive | 4. | Sex-linked dominant |
1. Haploidy
2. Nullisomy
3. Monosomy
4. Trisomy
1. Nonsense
2. Silent
3. Missense
4. Frame shift
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