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Evolution

AIPMT 2003MCQMedium📈 Topic in 38% papers+4−1
Ques. 1AIPMT 2003

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

Answer

(1) They are uniparental in origin and do not take part in recombination

Solution

Mitochondrial DNA is inherited only from the mother, and the Y chromosome (non-recombining part) only from the father to son.

⇒ Both are uniparental and do not undergo recombination, so their sequences change only by mutation.

∴ Their lineages can be traced back across generations, which makes them ideal for studying human evolution.

Answer: (1)

Keep practising — Evolution

Ques. 2AIPMT 2002

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

  1. natural selection
  2. induced mutation
  3. reproductive isolation
  4. genetic drift.
Ques. 3AIPMT 2002

Which of the following is important for speciation ?

  1. Behavioural isolation
  2. Seasonal isolation
  3. Tropical isolation
  4. Reproductive isolation
Ques. 4AIPMT 2002

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
Ques. 5AIPMT 2002

Genetic drift operates in : -

  1. Slow reproductive population
  2. Small isolated population
  3. Large isolated population
  4. Fast reproductive population
Ques. 6AIPMT 2002

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

  1. O2
  2. Light
  3. Water
  4. Temperature
Ques. 7AIPMT 2002

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
Ques. 8AIPMT 2002

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

  1. Gene flow
  2. Mutation
  3. Sexual selection
  4. Random mating
Ques. 9AIPMT 2002

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

  1. DNA
  2. r-RNA
  3. m-RNA
  4. t-RNA
Ques. 10AIPMT 2002

In which era reptiles were dominant ?

  1. Archaeozoic era
  2. Mesozoic era
  3. Coenozoic era
  4. Paleozoic era
Ques. 11AIPMT 2001

Half life period of C14 is : -

  1. 5000 years
  2. 50 years
  3. 500 years
  4. 5 104 years

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