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Q. No.Which of the following is a recessive trait in Pisum sativum?
| 1. | Yellow pod color | 2. | Axial flower position |
| 3. | Inflated pod shape | 4. | Violet flower color |
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The improvement of microscopy techniques in the late 1800s set the stage for the emergence of modern genetics because:
| 1. | it revealed new and unanticipated features of Mendel’s pea plant varieties. |
| 2. | it allowed biologists to study meiosis and mitosis, revealing the parallels between the behaviors of genes and chromosomes. |
| 3. | it allowed scientists to see the DNA present within chromosomes. |
| 4. | it led to the discovery of mitochondria. |
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To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.
What would be the correct definition of a ‘locus’ in genetics ?
| 1. | One version of a gene. |
| 2. | The location of a gene along the chromosome. |
| 3. | The character of the gene effects. |
| 4. | The mechanism of action of a gene. |
PisumSativum is self-pollinated in crops. Why this can be a problem when used for experiments like those conducted by Mendel?
| 1. | Self-pollinated plants tend to be weaker and require more care. |
| 2. | Self-pollinated plants are not able to produce viable seeds due to inbreeding. |
| 3. | Stamens must be removed from self-pollinated plants to control fertilization. |
| 4. | Pistils of self-pollinated plants are unable to accept pollen from other plants. |
The number of recessive traits in a garden pea in the list given in the box below is:
| dwarf stem height, wrinkled seed shape, yellow seed color; yellow pod color, inflated pod shape, terminal flower position, violet flower color |
| 1. | 2 | 2. | 3 |
| 3. | 4 | 4. | 5 |
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To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.
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
If Mendel might have studied 7 pairs of characters in a plant with 12 chromosomes instead of 14 then:
| 1. | He could not discover an independent assortment |
| 2. | He might have discovered linkage |
| 3. | He might have discovered crossing over |
| 4. | He might have not observed dominance |
What decides the frequency of an allele in a population?
| 1. | Dominance |
| 2. | Its location on a particular chromosome |
| 3. | Its degree of expression |
| 4. | Natural selection |
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To unlock all the explanations of 38 chapters you need to be enrolled in MasterClass Course.
A self-fertilizing trihybrid plant forms:
| 1. | 4 different gametes and 16 different zygotes |
| 2. | 8 different gametes and 16 different zygotes |
| 3. | 8 different gametes and 32 different zygotes |
| 4. | 8 different gametes and 64 different zygotes |
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