comparative embryology

Comparative Embryology - Haeckel (1834-1919) formulated that 'ontogeny recapitulates phylogeny'. This means that the developmental stages that an organism goes through repeat the evolutionary history of the group to which the organism belongs. Stages in Embryological D..

Haeckel (1834-1919) formulated that 'ontogeny recapitulates phylogeny'. This means that the developmental stages that an organism goes through repeat the evolutionary history of the group to which the organism belongs. Though it does not explain the mechanism of evolution, the study of the emb..

Inspite of many evidences, studies and theories, we are still not aware of how the evolution actually occurs. The search for this knowledge continues. The various sources from which evidences are available for studying the mechanism of evolution are: Palaeontology Geological Distribution Compa..

Question: Links between organisms that show branching pattern of evolutionary relationships are shown by_____. 1. living fossils 2. comparative embryology 3. phylogenetic trees 4. two fossil layerss Answer: ..

Effect of natural selection on the phenotype of an organism Lethal alleles in a homozygous individual carried in a heterozygote New mutations in a gene pool Variation within a species - survival under changed environmental conditions Conditions for Hardy-Weinberg equilibrium in a populati..

Effect of natural selection on the phenotype of an organism Lethal alleles in a homozygous individual carried in a heterozygote New mutations in a gene pool Variation within a species - survival under changed environmental conditions Conditions for Hardy-Weinberg equilibrium in a populati..

(the collection of genes) will be inherited by successive generations. Darwin proposed the theory of natural selection. According to this theory, the reproduction in large numbers resulted in a struggle for existence and competition. This leads to survival of the fittest. Thus the best of the genet..

>Weismann proposed the theory of continuity of germplasm, only the changes that affect the germ cells and the germplasm (the collection of genes) will be inherited by successive generations Darwin proposed the theory of natural selection to explain the 'survival of the fittest' to lead to the next ..

The Linnaean Hierarchy - The Linnaean system of classification consists of a hierarchy of graded taxonomic (named) ranks that are called as taxa . Any given taxon (singular) may contain several lower taxa, which can be usually distinguished based on certain common characteristics. Such lower ranks ..

. Neo-Darwinism attempts to explain evolution in terms of genotypic variations, natural selection and isolation. The occurrence of organic evolution is established by the innumerable evidences that are available from the different branches of biology. The study of extinct organisms (palaeontology) ..