Evolution

In recent years, DNA sequences (nucleotide sequence) of mt-DNA and Y chromosomes were considered for the study of human evolution, because :-

1. They are uniparental in origin and do not take part in recombination
2. They can be studied from the samples of fossil remains
3. Their structure is known in greater detail
4. They are small, and therefore, easy to study

Some bacteria are able to grow in streptomycin containing medium due to

1. natural selection
2. induced mutation
3. reproductive isolation
4. genetic drift.

Which of the following is important for speciation ?

1. Behavioural isolation
2. Seasonal isolation
3. Tropical isolation
4. Reproductive isolation

Which of the following are homologous organs ?

1. Wings of birds & Pectoral fins of fish
2. Wings of bat & Butterfly
3. Legs of frog & Cockroach
4. Wings of birds & Locust

Genetic drift operates in : -

1. Slow reproductive population
2. Small isolated population
3. Large isolated population
4. Fast reproductive population

There is no life on moon due to the absence of -

1. O2
2. Light
3. Water
4. Temperature

According to fossils which discovered up to present time, origin and evolution of man was started from

1. Java
2. Africa
3. China
4. France

In which condition, the gene ratio remains constant for any species population ?

1. Gene flow
2. Mutation
3. Sexual selection
4. Random mating

Sequence of which of the following is used to know the phylogeny ?

1. DNA
2. r-RNA
3. m-RNA
4. t-RNA

In which era reptiles were dominant ?

1. Archaeozoic era
2. Mesozoic era
3. Coenozoic era
4. Paleozoic era