Tag: zoology

Recaptulation theory was modified in the light of evolution as biogentic law by a German biologists - Ernst Haeckel in 1968 AD. It states that ontogeny repeats phylogeny which means that an individual during its own development (ontogeny) passes through ancestral listor (Phylogeny).

A transformation is an adjustment in DNA, the inherited material of life. A creature's DNA influences what it looks like, how it carries on, and its physiology. So an adjustment in a living being's DNA can cause changes in all parts of its life. Changes are basic to advancement; they are the crude material of hereditary variety.                                                                             

So, the correct option is 'Mutations'.

Germplasm is living hereditary assets, for example, seeds or tissues that are kept up with the end goal of creature and plant reproducing, protection, and other research employment. Germplasm accumulation is vital for the support of organic decent variety and sustenance security.

According to De Vries theory of evolution:

Variation was first explained by Hugo De Vries in 1901 while studying evening primrose species. He suggested that species are not formed by continuous changes but with sudden changes called mutation. Thus, the correct answer is 'De Vries.'

Hugo De Vries gave Mutation theory in 1901. He worked on plant Oenothera lamarckiana, commonly known as evening primrose and found several aberrant types. When the plant was self-pollinated and its seeds were allowed to grow, the majority of F$ _1$ plants were similar to the parents, but a few were different plants. Same results were found in F$ _2$ generation. He resulted in that origin of species is through sudden, large changes of traits from another species and these sudden changes are due to Mutation in the gene pool which passes from one generation to another. Later on, it was revealed that most of the variants isolated from Oenothera lamarckiana were due its anomalous chromosome behaviour i.e., chromosome forms multiple rings at meiosis and chromosomal end segments only involves in recombination (low-level crossing over) and plant shows complex heterozygosity i.e., during meiosis maternal and paternal chromosomes are arranged in alternate order. Thus, the correct answer is ‘Complex heterozygote with anomalous chromosome behaviour.’

1. The work of Thomas Malthus 'Principle of population' inspired Darwin's study of evolution.
   2. Paul Kammarer studied the pattern of inheritance on Proteus anguimia, commonly called 'The midwife toad'.
   3. Hugo de Vries brought forward the idea of mutations after his Workin on Oenothera lamarckiana (evening primose).
   4. Bernard kettleweli studies industrial melanisation on Biston betularia.
   So, the correct option is 'All are correct'.

The pineal gland is a small endocrine gland in the vertebrate brain. It produces melatonin, a serotonin derived hormone, that affects the modulation of sleep patterns in both seasonal and circadian rhythms.

The diencephalon is the region of the embryonic vertebrate neural tube that gives rise to posterior forebrain structures including the thalamus, hypothalamus, posterior portion of the pituitary gland, and pineal gland. The pineal gland arises as a dorsal outgrowth of the caudal portion of the diencephalon. In the adult animal, it lies in the midline of the roof of the third ventricle.