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प्रश्न
Mendel published his work on inheritance of characters in 1865, but it remained unrecognised till 1900. Give three reasons for the delay in accepting his work.
उत्तर
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Lack of communication and publicity.
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His concept of factors (genes) as discrete units that did not blend with each other was not accepted in the light of variations occurring continuously in nature.
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Mendel’s approach to explain biological phenomenon with the help of mathematics was also not accepted.
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संबंधित प्रश्न
Considering the relationship in the first pair, complete the second pair:
rr : Homozygous : : Rr : ....................
In Mendel’s experiments, tall pea plants (T) are dominant over dwarf pea plants (t).
Draw a Punnett square board to show the gametes and offspring when both the parents are heterozygous for tallness.
Define the following:
Phenotype
Define the following:
Recessive
Explain the following terms:
Laws of Inheritance
Predict the genotype and phenotype of the following cross in pea.
TTrr x ttRR
(Capital letters show dominance)
A plant with green pods and smooth seeds with the genotype Ggss will give rise to the following gametes:
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?
Two pea plants one with round green seeds (RRyy) and another with wrinkled yellow (rrYY) seeds produce F1 progeny that have round, yellow (RrYy) seeds. When F1 plants are selfed, the F2 progeny will have new combination of characters. Choose the new combination from the following:
- Round, yellow
- Round, green
- Wrinkled, yellow
- Wrinkled, green
