CBSE 2025, Set 1

Question

Explain the difference in inheritance pattern of flower colour in garden pea plant and snap-dragon plant with the help of monohybrid crosses.

Edvaya · Accepted Answer

The correct answer is Subjective. **SOLUTION** **Garden Pea Plant (Law of Dominance):** In garden peas, flower color inheritance follows complete dominance. When a homozygous Violet flower ($WW$) is crossed with a homozygous White flower ($ww$), all $F_1$ progeny ($Ww$) display the dominant Violet color. * *Cross:* $WW 	imes ww ightarrow$ All $Ww$ (Violet). **Snapdragon Plant (Incomplete Dominance):** In snapdragon (*Antirrhinum*), flower color shows incomplete dominance. When a homozygous Red flower ($RR$) is crossed with a homozygous White flower ($rr$), the dominant allele is not completely dominant over the recessive allele. As a result, all $F_1$ progeny ($Rr$) are intermediate, exhibiting Pink color. * *Cross:* $RR 	imes rr ightarrow$ All $Rr$ (Pink).

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Biology > Reproduction And Genetics > Principles Of Inheritance And Variation

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