Q. 9

In a monohybrid cross of plants with red and white flowered plants, Mendel got only red flowered plants. On self-pollinating these F1 plants got both red and white flowered plants in 3:1 ratio. Explain the basis of using RR and rr symbols to represent the genotype of plants of parental generation.

Answer :

On crossing red (RR) and white(rr) flowered plants, Mendel got only red flowered plants with genotype Rr. This is the filial progeny (F1) or plants of the 1st hybrid generation. F1 always resembled either one of the parents and the trait of other parent was not seen in them.

Now on self-pollinating these F �1 plants (that is Rr x Rr) he got some of the offspring’s of Filial2 generation to be white; which was not seen in F1 was now expressed. The red and white traits were identical to their parental type and did not show any blending (none was of pink colour). F2 stage , both the traits were expressed in the proportion 3:1.



Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Related Videos
How to solve applied questions based on Mendel's law of inheritanceHow to solve applied questions based on Mendel's law of inheritanceHow to solve applied questions based on Mendel's law of inheritance46 mins
Everything About Genetic DisordersEverything About Genetic DisordersEverything About Genetic Disorders55 mins
Basic Quiz - Principles of Inheritance & VariationBasic Quiz - Principles of Inheritance & VariationBasic Quiz - Principles of Inheritance & Variation53 mins
Advanced Quiz - Principles of Inheritance & VariationAdvanced Quiz - Principles of Inheritance & VariationAdvanced Quiz - Principles of Inheritance & Variation46 mins
Interactive Quiz on Principles of Inheritance and VariationInteractive Quiz on Principles of Inheritance and VariationInteractive Quiz on Principles of Inheritance and Variation33 mins
Pedigree chartPedigree chartPedigree chart58 mins
Medelian disorder series: Thalassemia, Sickle cell anaemia & PhenylketonuriaMedelian disorder series: Thalassemia, Sickle cell anaemia & PhenylketonuriaMedelian disorder series: Thalassemia, Sickle cell anaemia & Phenylketonuria60 mins
How to solve questions of pedigree chartHow to solve questions of pedigree chartHow to solve questions of pedigree chart49 mins
Meselson and Stahl experimentMeselson and Stahl experimentMeselson and Stahl experiment49 mins
Interactive Quiz on Molecular basis of Inheritance-02Interactive Quiz on Molecular basis of Inheritance-02Interactive Quiz on Molecular basis of Inheritance-0234 mins
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation
caricature
view all courses