Relationships between organisms

Created by: elyornais
Created on: 22-02-15 18:15

Describe DNA hybridisation.

DNA from 2 species extracted and isolated. Heated so hydrogen bonds break and DNA unravels. DNA cools and reforms. Hybrid DNA is isolated and heated in small increments. Higher temperature=more closely related.

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How were plants originally classed?

Based on the appearance of their physical features.

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How are the plants classified now?

Based on DNA sequences

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How would the amino acid sequences of two species be compared?

By counting the number of similarities or differences in each sequence

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What is immunological comparisons of proteins?

Serum protein from species A injected into B. B produces antibodies specific to antigens on this protein. Serum from B mixed with blood serum of C. Precipitate formed. Greater number of similar antigens=more precipitate formed=more close related.

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Why is courtship behaviour important?

-Recognise members of their own species. -Identify mate capable of breeding. -Form a pair bond. -Synchronise mating for maximum possibility of sperm and egg meeting.

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Other cards in this set

Card 2

Front

How were plants originally classed?

Back

Based on the appearance of their physical features.

Card 3

Front

How are the plants classified now?

Back

Card 4

Front

How would the amino acid sequences of two species be compared?

Back

Card 5

Front

What is immunological comparisons of proteins?

Back

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Relationships between organisms