Linkage in Genetics

What is the unit of linkage map?

• (a) Morgan
  

• (b) Centi-morgan

• (c) Centimeter

• (d) Angstrom

There are 4 pairs of chromosomes in a Drosophila. The linkage groups present in it are

• (a) one more than the pair of chromosomes

• (b) four

• (c) one less than the pair of chromosomes

• (d) eight

Repulsion and coupling are two faces of

• (a) mutation

• (b) chiasmata

• (c) crossing over

• (d) linkage

This is the reason why Mendel did not recognize linkage phenomenon in his experiments

• (a) he studied only pure plants

• (b) he did not have a powerful microscope

• (c) characters he studied were situated on different chromosomes

• (d) many chromosomes to handle

Which of the following statement is NOT true regarding linkage group?

• (a) Group of physically linked genes
  
  
  

• (b) Represent a haploid number of chromosomes

• (c) Shown by linkage map

• (d) Linkage groups are not correlated with each other

Name the organism whose first genetic map was made?

• (a) Rat
  
  
  

• (b) Arabidopsis

• (c) Fly

• (d) Drosophila

The tendency of two or more than two genes to stay together during inheritance is called

• (a) Linkage

• (b) Gene interaction

• (c) Crossing over

• (d) Genetics

Linkage ________ as the distance between two genes ______________

• (a) Decreases, decreases
  
  
  

• (b) Unaffected, Decreases

• (c) Decreases, Increases

• (d) Increases, Increases

In Drosophila males there is complete linkage. What is the reason behind this?

• (a) The genes are very closely located
  
  
  

• (b) No synapsis

• (c) Coupling theory

• d) Unknown reason

Linkage results in

• 
  
  (a) Formation of more parental phenotype
  

• (b) Formation of more Wild phenotype

• (c) Formation of more Dominant phenotype

• (d) Formation of more recombinant phenotype