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प्रश्न
Give any four reasons for Mendel's success.
उत्तर
Reasons for Mendel's Success
A combination of luck, foresight, mathematical approach and scientific aptitude contributed to the success of Mendel's experiments.
Method of Working
1. Mendel studied inheritance of one character at a time whereas earlier scientists had considered the organism as a whole.
2. Mendel carried out experiments up to the second and third generations.
3. He maintained the statistical records of all the experiments and analysed them carefully.
4. Cross-breeding was done between the parents of pure lines.
5. The pure lines of parent plants were ascertained by a series of self-crossing tests between progeny of each successive generation.
6. Mendel's experiments dealt with a large sample size.
Advantages of Selecting Pea Plant
Mendel's selection of garden pea plant as experimental plant had following advantages:
1. It is an annual plant. Because of short life cycle, Mendel was able to study several generations of the plant within a short period.
2. Its flowers are complete and predominantly self-pollinating.
3. Because of self-pollination, plants are homozygous. Therefore, pure lines of pea plant were available.
4. Pea plant has a number of easily detectable contrasting characters, related as dominant and recessive.
5. Pea plant produces large number of seeds one generation.
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संबंधित प्रश्न
Define the following:
Phenotype
Choose the correct answer:
Mendel used ______ pairs of a characters for his experiments.
Choose the correct answer:
A cross where two pairs of alleles are considered is a ____________
A plant with green pods and smooth seeds with the genotype Ggss will give rise to the following gametes:
State whether the following statement is true or false:
The dominant character masks the recessive character.
Answer the following question.
Compare in any three ways the chromosomal theory of inheritance as proposed by Sutton and Bovery with that of experimental results on pea plant presented by Mendel.
When two genetic loci produce identical phenotypes in cis and trans position, they are considered to be ______.
A heterozygous violet-flowered pea plant is crossed to another homozygous violet- flowered pea plant. What percent of the progeny plants will have the recessive trait, i.e., white flowers?
If a round, green seeded pea plant (RRyy) is crossed with a wrinkled, yellow seeded pea plant (rrYY), the seeds produced in the F1 generation are ______.
In peas, tallness is dominant over dwarfness, and red colour of flowers is dominant over the white colour. When a tall plant bearing red flowers was pollinated with a dwarf plant bearing white flowers, the different phenotypic groups were obtained in the progeny in numbers mentioned against them:
Tall, Red = 138
Tall, White = 132
Dwarf, Red = 136
Dwarf, White = 128
Mention the genotypes of the two parents and of the four offspring types.
