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Embryonic studies of zebra fish and humans have shown common features exist - VCE - SSCE Biology - Question 7 - 2012 - Paper 1
Question 7
Embryonic studies of zebra fish and humans have shown common features exist. DNA studies have shown there are common genes for particular traits, such as body pigmen... show full transcript
Worked Solution & Example Answer:Embryonic studies of zebra fish and humans have shown common features exist - VCE - SSCE Biology - Question 7 - 2012 - Paper 1
Step 1
a. Explain why zebra fish and humans have a gene coding for the same trait but have variation within the gene.
Answer
Zebra fish and humans share a common ancestor, which contributes to their shared genetic coding for certain traits, such as body pigmentation. However, variation can arise due to different mutations that occur over time in each species. As each organism evolves, these mutations can lead to different alleles of the same gene, creating diversity in traits even when the basic genetic framework is similar.
Step 2
b. Explain the difference between selective breeding and natural selection.
Answer
Selective breeding involves the intentional choice of specific organisms by humans to breed and produce desired traits, such as size or color. In contrast, natural selection is a natural process where environmental factors act as selective agents, favoring organisms that are better adapted to survive and reproduce in their environment. While selective breeding is directed by human choice, natural selection is driven by nature.
Step 3