Question

ASSERTION- In peas, a pure tall plant (TT) is crossed with a short plant (tt). The ratio of pure tall plants to short plants in F1 is 3:1.
REASON- In F1 progeny, tallness is dominant over shortness. ​



Plz answer my exam is going on guys✌

Answer 1

Assertion is False and Reason is true.

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A pure tall plant (TT) is crossed with a short plant (tt).

Let's first workout the Punett Square.

$\begin{array}{|c|c|c|}\cline{1-3} & \sf T & \sf T \\ \cline{1-3} \sf t & \sf Tt & \sf Tt \\ \cline{1-3} \sf t & \sf Tt & \sf Tt \\ \cline{1-3} \end{array}$

Four Heterozygous Tall plants are produced.

• Genotype Ratio - 4 : 0
• Phenotypic Ratio - 4 : 0

Assertion is False.

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It is no secret that genes come in pairs, usually one dominant allele and the other being recessive allele.

Dominant Gene :

• An allele that expresses itself even with thr presence of another allele (dominant or recessive) is called a Dominant Gene. It tends to suppress the activity and expression of the other gene.

• According to Mendelian Genetics, a dominant gene is seen in all progenies of the First Filial Generation and in 3/4th of the population in Second Filial Generation. So, it's evident tallness is dominant over shortness.

Reason is True.

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