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Principles Of Inheritance And Variation

Question
CBSEENBI12002375
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A test cross is carried out to

  • determine the genotype of a plant at F2

  • predict whether two traits are linked

  • assess the number of alleles of a gene

  • determine whether two species or varieties will breed successfully

Solution

B.

predict whether two traits are linked

When F1 hybrid is crossed with its recessive parent, it is called test cross, By test cross heterozygosity and homozygosity of the organism can be tested. It gives 1:1 ratio in monohybrid and 1:1:1:1 ratio in dihybrid condition. In presence of linkage the ratio varies from this.

Some More Questions From Principles of Inheritance and Variation Chapter

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 ?

Define heterogamy. Give an example.

How many chromosomes are found in human cells ?

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