set 5 MCQ Questions & Answers Detailed Explanation

Answer: (c)

The Boveri–Sutton chromosome theory or Chromosomal theory of inheritance is a fundamental unifying theory of genetics which identifies chromosomes as carriers of genetic material.

One gene one protein hypothesis was given by Beadle and Tatum which was later outdated after the discovery of alternate splicing.

Answer: (a)

Progressive evolution is the development of organisms with more elaborate and specialized structures from those having less elaborate features e.g. amphibians from reptiles.

Retrogressive or degenerative evolution is the development of simpler forms from more complex ones. Such evolution has occurred in the case of vestigial organs, parasitic forms, and in the reduction of overspecialized structures such as wings in flightless birds.

Parallel evolution is the formation of similar traits in related groups of organisms independently due to similar requirements e.g. running of two-toed deer and one toed horse.

The evolution of wings in insects and birds serve as an example of convergent evolution.

Answer: (b)

Answer: (d)

Colour blindness is the most common sex-linked genetic disorder, which is also expressed in recessive conditions.

Duchenne’s Muscular Dystrophy is caused by the “Dystrophin” gene which is the longest gene with 24,000 kbp in the human genome.

Answer: (b)

Test Cross involves the breeding of a dominant trait individual with a homozygous recessive individual, in order to determine the zygosity of the former by analysing proportions of offspring with the recessive phenotype.

Answer: (d)

The Green Spoonworm (Bonellia viridis) is a marine worm noted for displaying exceptional sexual dimorphism due to environment factors.