Q. No.In humans, the mechanism of sex determination is:
1.
XX – XY; male heterogamety
2.
XX – XY; female heterogamety
3.
XX – XO; male heterogamety
4.
XX – XO; female heterogamety
When Morgan hybridised yellow-bodied, white-eyed females to brown-bodied, red-eyed males and intercrossed their F1 progeny, the F2 ratio deviated very significantly from the 9:3:3:1 ratio. This can be attributed to the fact that:
| 1. | The genes are located on the X and Y chromosomes. |
| 2. | Fruit fly has abnormal chromosomes. |
| 3. | The genes are located on the X chromosome. |
| 4. | The genes exhibit incomplete dominance. |
In a dissimilar situation, the unit factor that expresses itself is called as:
| 1. | Dominant | 2. | Recessive |
| 3. | Epistatic | 4. | Hypostatic |
The number of alleles, the genotypic combinations, and phenotypes in the ABO system are respectively:
| 1. | 3, 6 and 4 | 2. | 3, 4 and 6 |
| 3. | 2, 3 and 4 | 4. | 2, 3, and 6 |
Thalassemia is inherited as a/an ____________ condition.
| 1. | Autosomal recessive | 2. | Autosomal dominant |
| 3. | Sex linked recessive | 4. | Sex linked dominant |
The family pedigree of Queen Victoria shows a number of haemophilic descendants as she was:
| 1. | Affected by the disease |
| 2. | Carrier for the disease |
| 3. | Did not carry the allele for hemophilia |
| 4. | Was not a queen |
A test cross is done to find out:
| 1. | Fitness of an organism |
| 2. | Genotype of a plant expressing dominant phenotype |
| 3. | The suitable parents for a Mendelian Cross |
| 4. | The hidden genotypic ratio of F2 phenotypes |
Haemophilia is inherited as a/an __________ condition.
| 1. | Autosomal recessive | 2. | Autosomal dominant |
| 3. | Sex linked recessive | 4. | Sexlinked dominant |
A genetic cross between homozygous individuals but with different alleles for a single gene of interest is called as:
| 1. | A reciprocal cross | 2. | Monohybrid cross |
| 3. | Dihybrid cross | 4. | Test cross |
What can the possible blood groups of progeny whose father and mother are of A and B blood groups, respectively?
| 1. | A and B only | 2. | AB only |
| 3. | All except O | 4. | A, B, AB, and O |
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