The sex in humans is determined at
(1) fertilization
(2) first trimester of pregnancy
(3) implantation
(4) organogenesis
Experimental verification of the chromosomal theory of inheritance was done by:
| 1. | Sutton | 2. | Boveri |
| 3. | Morgan | 4. | Mendel |
Select the correct match:
| 1. | Phenylketonuria | Autosomal dominant trait |
| 2. | Sickle cell anemia | Autosomal recessive trait chromosome - 11 |
| 3. | Thalassemia | X linked |
| 4. | Haemophilia | Y linked |
Identify the wrong statement with reference to the gene 'I' that controls ABO blood groups.
| 1. | A person will have only two of the 3 alleles. |
| 2. | When IA and IB are present together, they express same type of sugar. |
| 3. | Allele 'i' does not produce any sugar. |
| 4. | The gene (I) has three alleles. |
How many true-breeding pea plant varieties did Mendel select as pairs, which were similar except in one character with contrasting traits?
| 1. | 2 | 2. | 14 |
| 3. | 6 | 4. | 4 |
A diploid cell containing 10 chromosomes undergoes meiosis. How many chromosomes
are present in the cell after meiosis II?
(1) 2
(2) 5
(3) 10
(4) 15
A diploid cell containing 10 chromosomes undergoesmeiosis. How many chromosomes are present in the cell after meiosis I?
1. 2
2. 5
3. 10
4. 20
The number of types of gametes produced by a plant with the genotype AaBbCCDd will be:
| 1. | 2 | 2. | 4 |
| 3. | 8 | 4. | 16 |
Mating between a male with blood group A and a female with blood group B results in the progeny with blood group AB can be explained by:
1. Complete dominance
2. Incomplete dominance
3. Co-dominance
4. Epistasis
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