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Figure 5 shows a great tit on a bird feeder - Edexcel - GCSE Biology - Question 5 - 2020 - Paper 1
Question 5
Figure 5 shows a great tit on a bird feeder. Scientists have found that great tits living now have longer beaks than great tits living 50 years ago. Genetic analys... show full transcript
Worked Solution & Example Answer:Figure 5 shows a great tit on a bird feeder - Edexcel - GCSE Biology - Question 5 - 2020 - Paper 1
Step 1
Step 2
Which statement correctly describes a DNA molecule?
Answer
The correct statement describing a DNA molecule is:
A. two strands joined together by strong bonds to form a double helix.
This means that the molecule consists of two intertwined strands held together by hydrogen bonds between the bases.
Step 3
Explain how natural selection could have caused an increase in beak length because of the use of bird feeders.
Answer
The increase in beak length among great tits can be explained by natural selection as follows:
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Variation: Among the population of great tits, there exists variation in beak length. Some birds have longer beaks while others have shorter ones.
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Survival Advantage: With the introduction of bird feeders, those birds with longer beaks are better adapted to access food from feeders, giving them an advantage over their shorter-beaked counterparts.
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Reproduction: The longer-beaked birds are more likely to survive and reproduce, passing on their genes to the next generation.
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Generational Change: Over time, the frequency of longer beaks increases in the population as these traits become more common through selective pressure.
Step 4
Why are the cells from birds described as eukaryotic?
Answer
The cells from birds are described as eukaryotic because:
- A. they have membrane-bound organelles.
Eukaryotic cells contain various organelles, such as a nucleus, mitochondria, and endoplasmic reticulum, all surrounded by membranes.
Step 5
Give one reason why the three domain classification system was proposed.
Answer
One reason why the three domain classification system was proposed is:
- The classification is based on genetic analysis which has revealed that Archaea are more similar to Eukarya than to Bacteria, leading to a more refined understanding of the relationships between these domains.