A pea with white flower was crossed with another pea with white flower. When they selfed, the F₂ generation produced purple and white in the ratio of 9:7. The reason for the result is that

it is typical monohybrid Mendelian ratio

purple flower colour is dominant over white

it is a complementary factor

None of the above

Solution

it is a complementary factor

Complementary genes are the exception of Mendelian inheritance, in which two gene combinely produce a phenotype, which is not coded or expressed by a gene or allele alone.

Some More Questions From Principles of Inheritance and Variation Chapter

Name one trait that does not blend.

Give one example of genetic trait for each of the following in humans : (i) Lethality (ii) Multiple allelism.

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Principles Of Inheritance And Variation

Some More Questions From Principles of Inheritance and Variation Chapter

Name one trait that does not blend.

Give one example of genetic trait for each of the following in humans : (i) Lethality (ii) Multiple allelism.

What for symbols AA and Aa stand ?

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 ?

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