Question

In the developmental history of mammalian heart, it is observed that is passes through a two chambered fish like heart, three chambered frog like heart and finally four chambered stage.
To which hypothesis can this above cited statement be approximated?

• A. Lamarck's principle
• B. Mendelian principle
• C. Biogenetic law
• D. Hardy Weinberg law

Answer 1

Answer: (C)

Biogenetic law

• Biogenetic law or Recapitulation theory states that stages of development of a one animal embryo are same as other animals. this law also theorizes that ontogeny (embryonic development) of an individual repeats phylogeny, during each stage of development.
• On other hands, Lamarck's principle states that if one organism changes in order to adapt its environment, those changes are passed on to its offsprings. which means it doesn't repeat its phylogeny.
• Hardy Weinberg laws theorise that genotypic frequencies remain constant from generation to generation.
• While in Mendelian law genes or units of inheritance passes from one generation to other.

So correct answer is option C.