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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