Q. No.Assuming independent assortment, the ratio of progeny with the genotypes AaBb : Aabb : aaBb : aabb from a dihybrid cross AabB X AaBb will respectively be:
1.
4 : 3 : 2 : 1
2.
4 : 4 : 2 : 1
3.
4 : 2 : 2 : 1
4.
4 : 2 : 1 : 1
The father and the mother of a child, with blood group O, have the blood groups A and B respectively. If these parents then have non-identical twins, what is the probability that both twins will have blood group B?
| 1. | ¼ | 2. | 1/8 |
| 3. | ¾ | 4. | 1/16 |
After analysis of results drawn from his experiments with pea plants, Mendel concluded:
| 1. | There is considerable genetic variation in garden peas. |
| 2. | Traits are inherited in discrete units, and are not the results of "blending." |
| 3. | Recessive genes occur more frequently in the F1 than do dominant ones. |
| 4. | Genes are composed of DNA. |
A dihybrid test cross leads to a frequency of recombinants of 50% in progeny. The most obvious conclusion will be:
| 1. | The two genes likely are located on different chromosomes. |
| 2. | All of the offspring have combinations of traits that match one of the two parents. |
| 3. | Abnormal meiosis has occurred. |
| 4. | Independent assortment is hindered. |
In a family, father and son express a sex-linked recessive trait. The mother is phenotypically normal. What is the probability that she might be a carrier for the trait?
| 1. | 0 | 2. | 0.25 |
| 3. | 0.5 | 4. | 1.0 |
Total number of autosomes will be the same in:
| I. | Male and female humans |
| II. | Male and female birds |
| III. | Male and female Drosophila |
| IV. | Male and female grasshopper |
| 1. | Only I, II, and III | 2. | Only I, II, and IV |
| 3. | Only II, III, and IV | 4. | I, II, III, and IV |
The genetic change shown in the given figure shows the pathogenesis of:
| 1. | Phenylketonuria | 2. | Cystic fibrosis |
| 3. | Sickle cell anemia | 4. | Thalassemia |
In some Camellia cultivars, a cross between a red homozygous flower and a white homozygous flower will produce offspring that have red and white spots as shown in the given diagram. This can best be explained by:
| 1. | Incomplete dominance | 2. | Co-dominance |
| 3. | Pleiotropy | 4. | Variable expressivity |
The inheritance pattern of the trait shown in the given pedigree is most likely:
| 1. | Autosomal recessive | 2. | Sex-linked recessive |
| 3. | Autosomal dominant | 4. | Sex-linked dominant |
Transduction, transformation, and conjugation are all characterized by:
| I. | All require the presence of an outside factor to facilitate gene transfer. |
| II. | In all three processes, DNA is transferred as a single-stranded molecule. |
| III. | They all transfer large pieces of DNA into recipient cells. |
1. I & II only
2. I & III only
3. II & III only
4. None of the three statements is correct
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