Grain colour in wheat is determined by three pairs of polygenes. Following the cross AABBCC (dark colour) x aabbcc (light colour), in F₂ generation what proportion of the progeny is likely to resemble either parent?

None

Less than 5 percent

One third

Half

Solution

Less than 5 percent

Polygene results in quantitative inheritance. Quantitative inheritance is characterised by occurrence of intermediate forms between the parental type. There will be 7 (1 : 6 : 15 : 20 : 15 : 6 : 1) phenotypes when three polygene pairs are involved. The total number of progeny would be 64. Out of these sixty four only two will be likely to resemble either parents. Hence their proportion in F₂ generation would be 3.12 i.e. less than 5%.

Some More Questions From Principles of Inheritance and Variation Chapter

Who were the rediscoverers of Mendelism ?

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Principles Of Inheritance And Variation

Grain colour in wheat is determined by three pairs of polygenes. Following the cross AABBCC (dark colour) x aabbcc (light colour), in F₂ generation what proportion of the progeny is likely to resemble either parent?

None

Less than 5 percent

One third

Half

Some More Questions From Principles of Inheritance and Variation Chapter

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 ?

Define heterogamy. Give an example.

How many chromosomes are found in human cells ?

Why is male Drosophila regarded as heterogametic ?

What term is used for the two chromatids resulting from the interchange of segments during crossing over ?

What is name of a cross in which a dominant individual is crossed with a recessive parent?

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Principles Of Inheritance And Variation

Grain colour in wheat is determined by three pairs of polygenes. Following the cross AABBCC (dark colour) x aabbcc (light colour), in F2 generation what proportion of the progeny is likely to resemble either parent? None Less than 5 percent One third Half

Some More Questions From Principles of Inheritance and Variation Chapter

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 ?

Define heterogamy. Give an example.

How many chromosomes are found in human cells ?

Why is male Drosophila regarded as heterogametic ?

What term is used for the two chromatids resulting from the interchange of segments during crossing over ?

What is name of a cross in which a dominant individual is crossed with a recessive parent?

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation

Grain colour in wheat is determined by three pairs of polygenes. Following the cross AABBCC (dark colour) x aabbcc (light colour), in F₂ generation what proportion of the progeny is likely to resemble either parent?

None

Less than 5 percent

One third

Half