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Principles Of Inheritance And Variation

Question
CBSEENBI12001683
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A teacher wants his/her students to find the genotype of pea plants bearing purple coloured flowers in their school garden. Name and explain the cross that will make it possible.

Solution

Purple colour is a dominant phenotype in pea plants. To determine the genotype of the pea plant with purple flowers the students can use the process of Test cross. In test cross the pea plant whose genotype is to be determined is crossed with a homozygous recessive parent (pp) having white flowers. The test cross help the students to determine whether the genotype of the plant is heterozygous dominant (Pp) or homozygous dominant (PP).

So the Pea plant with an unknown genotype i.e.  Px that can be either Pp or PP is crossed with homozygous recessive parent i.e. pp.

If half of the flowers are purple and the other half is white then the genotype of the plant is heterozygous dominant that is Pp

If all the flower produced after the cross are purple then the genotype would be PP homozygous dominant.

Some More Questions From Principles of Inheritance and Variation Chapter

Mention the phenomenon of pleiotropy by giving an example.

Name the plant that shows incomplete dominance in respect of the colour of its flower.

Write the genotypes of man with blood group A.

What is Mendel’s monohybrid phenotypic ratio ?

Write down Mendel’s dihybrid Phenotypic ratio 

Who were the rediscoverers of Mendelism ?

What are the real determinants of what an organism will become ?

What is the unique feature of F1 generation ?

What will be the genetic make up of an organism which suffers from sickle cell anaemia ?

What do the symbols square and circle in a pedigree chart indicate ?

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