Hello aspirant,

Biochemical evidence is a powerful tool to support the theory of evolution, providing insights into the relationships between different organisms at the molecular level. Here are some key examples you might encounter in your Class 12 Zoology studies:

1. Homologous Proteins:

Definition: Proteins that share a common evolutionary origin, often due to a shared ancestor.
Example: Cytochrome c, a protein involved in cellular respiration, is found in almost all living organisms. The amino acid sequence of cytochrome c shows similarities between different species, suggesting a shared evolutionary history.

2. Genetic Code Universality:

Definition: All known organisms use the same genetic code to translate DNA into proteins.
Significance: This universality implies a common ancestor for all life on Earth.

3. Molecular Clocks:

Definition: The use of DNA sequences to estimate the time of divergence between different species.
How it works: By comparing the genetic differences between species, scientists can estimate how long ago they diverged from a common ancestor.

4. DNA Hybridization:

Definition: A technique used to measure the similarity between DNA sequences from different species.
How it works: DNA from two species is heated to separate the strands, then allowed to reanneal. The degree of hybridization reflects the similarity between the DNA sequences.

5. Metabolic Pathways:

Definition: The series of chemical reactions that occur in living organisms to convert substances into other substances.
Similarity: Many metabolic pathways are shared by a wide range of organisms, suggesting a common evolutionary origin.

These are just a few examples of biochemical evidence. Your Class 12 Zoology textbook will likely provide more detailed information and specific case studies.

I hope this information helps you.

Biochemical evidence for evolution in Class 12 Zoology includes various key molecules and biochemical mechanisms shared by different organisms. Here are some examples

· Homologous Molecules: Biochemicals that are very similar in structure and function in all organisms, such as cytochrome c, which plays a crucial role in cellular respiration

· Metabolic Pathways: All life forms use the same methods of trapping and processing energy, then converting that energy into proteins and amino acids

· Enzymes: Energy-producing catabolic reactions are catalyzed by almost common enzymes in plants and animals

· Endosymbiotic Theory: Organelles like mitochondria and chloroplasts originated from prokaryotes that had symbiotic relationships with larger cells

· Universal Genetic Code: The genetic code is nearly universal, with the same codons specifying the same amino acids in almost all organisms.

These similarities suggest that different organisms share a common ancestor and have evolved over time

The presence of these biochemical similarities across diverse species provides strong evidence for evolution.

Biochemical evidence in zoology refers to the similarities in the biochemical composition of different organisms that provide evidence for common ancestry and evolutionary relationships. For Class 12th Zoology, biochemical evidence is discussed in the context of molecular biology, genetics, and evolutionary biology. Here are some key points:

• DNA and Genetic Material: All living organisms have DNA as their genetic material, which carries the instructions for growth, development, and functioning. The structure of DNA is universal, and similarities in DNA sequences among species indicate evolutionary relationships.
• Proteins and Enzymes: Similarities in the amino acid sequences of proteins, especially essential enzymes like cytochrome c, provide strong evidence for evolution. Organisms that share a common ancestor tend to have more similar proteins.
• Universal Genetic Code: The genetic code (the set of rules by which DNA or RNA is translated into proteins) is almost the same in all living organisms. This suggests that all forms of life share a common evolutionary origin
• Biochemical Pathways: Metabolic processes like glycolysis and the Krebs cycle are highly conserved across different species, indicating a common evolutionary pathway.
• Comparative Genomics: Comparison of genomes (the complete set of DNA) of different organisms reveals similarities that indicate evolutionary relatedness.

This biochemical evidence supports the theory of evolution and helps scientists understand the relationships between different species.

Hope it helps. Good Luck!

Hello,

Biochemical evidence in biology refers to the similarities in the molecular and biochemical makeup of organisms that indicate common ancestry. This can include the study of DNA sequences, proteins, and metabolic pathways across different species. For example, closely related organisms have more similar DNA and protein structures, which supports the idea that they share a common evolutionary history. This type of evidence helps in understanding how species have diverged over time while retaining some fundamental biochemical traits from their common ancestors.

THANK YOU!! ALL THE BEST!!

Hey there! Thanks for reaching out to Careers360 with your question about biochemical evidence for 12th grade zoology.

Biochemical evidence is a pretty interesting topic in zoology, isn't it? It's all about using chemical analysis to understand evolutionary relationships between different organisms. Some key areas you might want to look into are:

1. DNA and RNA comparisons

2. Protein sequencing

3. Immunological studies

These methods help scientists figure out how closely related different species are. For example, comparing the DNA sequences of humans and chimpanzees shows how similar we are genetically.

Is there a specific aspect of biochemical evidence you're trying to understand better? Or maybe you're working on an assignment? Let me know if you need any more details on this topic - I'd be happy to help break it down further!

Biochemical evidence refers to the similarities and differences in the molecular structures of organisms that support evolutionary relationships. This includes comparisons of DNA, RNA, proteins, and enzymes. For instance, closely related species often share similar sequences in their genetic material, indicating a common ancestry. Biochemical techniques, such as DNA sequencing and protein analysis, help scientists understand evolutionary connections and the diversity of life on Earth.