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
Give the complementary strand sequence for this DNA template.
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Answer
The complementary strand sequence for the DNA template A T G T T A C G T is T A C A A T G C A.
Step 2
Which statement correctly describes a DNA molecule?
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Answer
The correct statement describing a DNA molecule is that it consists of two strands joined together by strong bonds to form a double helix.
Step 3
Explain how natural selection could have caused an increase in beak length because of the use of bird feeders.
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Answer
Over the last 50 years, great tits that have slightly longer beaks may have been more successful at feeding from bird feeders, which provide a consistent food source. As these birds were able to feed more efficiently, they likely had higher survival rates and reproductive success. Over time, this advantageous trait of longer beaks became more common in the population through the process of natural selection.
Step 4
Why are the cells from birds described as eukaryotic?
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Answer
Bird cells are described as eukaryotic because they have membrane-bound organelles, which is a characteristic feature of eukaryotic cells.
Step 5
Give one reason why the three domain classification system was proposed.
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Answer
One reason for proposing the three domain classification system is the advancement in genetic analysis techniques, which revealed that the DNA of Archaea is more similar to Eukaryotes than previously thought.
