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Question
The F2 progeny of a monohybrid cross showed phenotypic and genotypic ratio as 1:2:1 unlike that the Mendel’s monohybrid F2 ratio. With the help of a suitable example, work out a cross and explain how it is possible.
Solution
Monohybrid cross is a cross where two forms of a single trait are hybridised. Mendel crossed a pure tall pea plant with a pure dwarf pea plant and obtained all tall plants in the first filial generation. The character which appeared in the F1 generation is called the dominant character, whereas the character which is not expressed in the F1 generation is called the recessive character. After intercrossing the hybrids of the F1 generation, he obtained the tall and the dwarf progeny in the ratio 3:1 (phenotypic ratio), but the genetic ratio was 1:2:1 which is TT, Tt and tt.
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RELATED QUESTIONS
Which one of the following is the phenotypic monohybrid ratio in F2 generation?
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TT x Tt
(Capital letters show dominance)
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Long answer type question.
Explain with suitable example an independent assotrment.
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Read the following and answer from given below:
Prashant wanted to find the genotype of a pea plant bearing purple coloured flowers in his kitchen garden. For this, he crossed purple-flowered plants with white-flowered plants. As a result, all plants which were produced had purple flowers only. Upon selfing these plants, 75 purple flower plants and 25 white flowers plants were produced. Now, he can determine the genotype of a purple-flowered plant by crossing it with a white-flowered plant.
The character i.e., the purple colour of the flowers that appeared in the first filial generation is called ______
