The random changes in the allele frequency occurring by chance is termed as

1. genetic variability

2. genetic drift

3. gene migration

4. mutation

The first living organisms that appeard on the planet, according to the most accepted

view, were

1. anaerobic

2. aerobic

3. photosynthetic

4. none of the above

Which of these are considered most essential in the origin of life?

1. Enzymes

2. Nucleic acids

3. Carbohydrates

4. Proteins

Genetic drift operates only in

1. island population 

2. smaller population 

3. larger population

4. none of these.

The cranial capacity was largest among the 

(a) Peking man               (b) Java ape man

(b) African man              (d) Neanderthal man

The early-stage human embryo distinctly possesses

1. gills                             

2. gill slits

3. external ear (pinna)       

4. eyebrows                             

A baby has been born with a small tail. It is a case exhibiting

1. retrogressive evolution

2. mutation 

3. atavism

4. metamorphosis.

Potato and sweet potato 

(1) have edible parts which are homologous organs

(2) have edible parts which are analogous organs

(3) have been introduced in India from the same place

(4) are two species of the same genus.

"Homo sapiens" implies

(1) Human race

(2) Human beings

(3) Modern man

(4) None of these

Wings of pigeon, mosquito and bat show

1. divergent evolution 

2. atavism

3. convergent evolution 

4. all of these