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Principles Of Inheritance And Variation

Question

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Two genes R and Y are located very close on the chromosomal linkage map of a maize plant. When RRYY and rryy genotypes are hybridised, the F₂ segregation will show:

higher number of the recombinant types.

segregation in the expected 9 : 3 : 3 : 1 ratio

segregation in 3 : 1 ratio

higher number of the parental types.

Solution

D.

higher number of the parental types.

Law of independent assortment does not applicable when the gene of different character occupy on the same homologous chromosome i.e., linked gene.

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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