Which of these statements is true about DNA and evolution?
1.Each living species has DNA made from different ingredients, showing that organisms have evolved.
2. Two species with very similar DNA likely evolved from a common ancestor.
3. DNA from related species is identical providing evidence that all organisms have evolved in the same way.
4. Two species that have the same DNA provide evidence that evolution has taken place.
Answers
Answer:
1. False (the component of DNA i.e. sugar phosphate backbone and nitrogen bases is always same in every DNA, only the arrangement and sequence that matter and include a specific gene resulting into a characteristic feature.)
2. True
3. True
4. True (not 100 % sure)
Explanation:
multiple types of evidence to trace evolutionary changes that occur over long time periods.
Similarities and differences among biological molecules (ex: in the DNA sequence of genes) can be used to determine species' relatedness.
Biogeographical patterns provide clues about how species, both alive and extinct, are related to each other.
The fossil record, though incomplete, provides valuable information about what species existed at particular times in Earth’s history.
nitrogen base sequence ( A,T,G,C) ⇒ DNA content ⇒ gene ⇒ special features ⇒ a character of a particular species ⇒ if 2 species / organisms are showing similar kind of features and characteristics ( like morphological/ embryological/ anatomical, paleontological similarities) ⇒ they may have evolved from a common ancestor ⇒ evolution.
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