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Calculation of Phenotypic and Genotypic Ratios

Pure-bred tal...

Question

Pure-bred tall pea plants are first crossed with pure-bred dwarf pea plants. The pea plants obtained in the $F_{1}$ generation are then cross-bred to produce $F_{2}$ generation of pea plants.

$∙$ (b) What is the ratio of tall plants to dwarf plants in $F_{2}$ generation?

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Solution

In the $F_{2}$ generation, the ratio of tall plants to dwarf plants will be 3 : 1.

Parents : TT $\times$ tt
Gametes : T t
$↓$

$F_{2}$ Generation $\begin{matrix} T & t T & T T (Tall & T t (Tall) t & T t (Tall) & t t (dwarf) \end{matrix}$

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Similar questions

Q. Pure-bred pea plants A are crossed with pure-bred pea plants B. It is found that the plants which look like A do not appear in F₁ generation but re-emerge in F₂ generation. Which of the plants A and B are : (i) tall, and (ii) dwarf? Give reason for your answer.

Q. If we cross pure-bred tall (dominant) pea plant with pure-bred dwarf (recessive) pea plant we will get Pea plant of

F_{1}

generation, then we obtain Pea plants of

F_{2}

generation.
(a) What do the plants of

F_{1}

generation look like?
(b) State the ratio of tall plants to dwarf plants in

F_{2}

generation.
(c) State the type of plants not found in

F_{1}

generation but appeared in

F_{2}

generation, mentioning the reason for the same.

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Calculation of Phenotypic and Genotypic Ratios

Standard XII Biology

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