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Independent assortment of genes does not take place when

 
 
 
 

Barr body in mammals represents

 
 
 
 

Initial clue about the genetic/chromosomal mechanism of sex-determination can be traced back to some of the experiments carried out in

 
 
 
 

If a homozygous red flowered plant is crossed with a homozygous white flowered plant, the offsprings would be

 
 
 
 

Bird females have chromosome arrangement as

 
 
 
 

Match Column-I with Column-II and select the correct option from the codes given below. Column-I Column-II

 
 
 
 

Which of the following is not a dominant trait in edible pea?

 
 
 
 

A gene pair hides the effect of another gene. The phenomenon is

 
 
 
 

Select the correct statement from the ones given below with respect to dihybrid cross.

 
 
 
 

The dihybrid ratio in F2 – generation is

 
 
 
 

At a particular locus, frequency of allele A is 0.6 and that of allele a is 0.4. What would be the frequency of heterozygotes in a random mating population at equilibrium?

 
 
 
 

Primary source of allelic variation is

 
 
 
 

In which of the sex determination both male and female have same number of chromosomes?

 
 
 
 

Lack of independent assortment of two genes A and B in fruit fly Drosophila is due to

 
 
 
 

Gene pool is referred to

 
 
 
 

When a pink flowered Antirrhinum plant is test crossed, then phenotypic ratio in resulting progenies is

 
 
 
 

Given below is a highly simplified representation of the human sex chromosomes from a karyotype.


The genes a and b could be of

 
 
 
 

Which one is a hereditary disease ?

 
 
 
 

Mark the odd one (w.r.t. true breeding line)

 
 
 
 

The distance between the genes is measured by

 
 
 
 

Sickle cell-anaemia disorder arises due to

 
 
 
 

Select the incorrect statement from the following:

 
 
 
 

Mark the odd one (w.r.t. F2 generation of Mendelian dihybrid cross)

 
 
 
 

Absence or excess or abnormal arrangement of one or more chromosomes results in

 
 
 
 

Individuals having homomorphic sex chromosomes produce

 
 
 
 

Three children in a family have blood types O, AB and B respectively. What are the genotypes of their parents?

 
 
 
 

The most striking example of point mutation is found in a disease called

 
 
 
 

When Mendel self hybridised the F1 plants (RrYy), he found that dominant and recessive traits of one character are segregated in a

 
 
 
 

Cystic fibrosis, Myotonic dystrophy and Thalassemia are

 
 
 
 

Which of the following abnormalities is due to autosomal dominant mutation?

 
 
 
 

XO-chromosomal abnormality in human beings causes

 
 
 
 

Frame shift mutation occurs when

 
 
 
 

When one gene controls two or more different characters simultaneously, the phenomenon is called

 
 
 
 

In garden pea, starch is synthesised effectively in

 
 
 
 

Generation of non-parental gene combinations is termed as

 
 
 
 

ABO blood group system is due to

 
 
 
 

If both parents are carriers for thalassemia, which is an autosomal recessive disorder, what are the chances of pregnancy resulting in an affected child?

 
 
 
 

Red (RR) Antirrhinum is crossed with white (WW) one. Offspring RW are pink. This is an example of

 
 
 
 

Chromosomal theory of inheritanc was given by

 
 
 
 

The basis of karyotaxonomy is

 
 
 
 

Given below is a representation of a kind of chromosomal mutation. What is the kind of mutation represented?

 
 
 
 

Phenylketonuria is an inborn error of metabolism that is inherited as

 
 
 
 

Mark the odd one w.r.t. syndrome which occur due to failure of segregation of homologous pair of chromosomes during cell division cycle.

 
 
 
 

Which of the following disorder is seen in human female only?

 
 
 
 

Which of the following is incorrect regarding ZW-ZZ type of sex determination?

 
 
 
 

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