Question

Ontogeny recapitulates phylogeny. This is
A. Hardy Weinberg law
B. Peeling law
C. Biogenetic law
D. Thomas law

Answer 1

Hint: The theory of recapitulation is also known as the biogenetic law or embryological parallelism. Embryological parallelism is often expressed using the phrase of Ernst Haeckel which says “ontogeny recapitulates phylogeny”. In the 1820s, it was formulated.

Complete answer:
> Option A- Hardy Weinberg law
The Hardy-Weinberg law also called Hardy Weinberg equilibrium is a principle which states that the genetic variation in a population in the absence of disturbing factors will be constant from one generation to the next generation. For example, the equilibrium of allele frequencies is disrupted by mutations by introducing new alleles into a population.

> Option B – Peeling law is not the correct option.

> Option C- Biogenetic law
Biogenetic law is also known as Recapitulation Theory, postulated in 1866 by Ernst Haeckel which stated that ontogeny recapitulates phylogeny. It means that the evolutionary development of the species was traced by the development of an animal embryo and young. Earlier this theory was influential and much-popularized but had a little significance in elucidating either evolution or embryonic growth.

> Option D- Thomas law
According to Thomas law, the development of blood vessels is governed by dynamic forces which act on their walls such as, dilation of the lumen is caused by an increase in velocity of blood flow; increment in the lateral pressure on the wall of the vessel makes it thick; the formation of new capillaries is caused by an increase in end-pressure.

Hence, The correct answer is option (C).

Note: Recapitulation theory was proposed by Muller. The study of embryological development of individual organisms is known as ontogeny while the evolutionary history of that organism is phylogeny. Ernst Haeckel explained this in detail in the year 1866 and named it 'Biogenetic law'. It means that ancestral adult stages are shown by an organism during its embryonic development.