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 given 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
A DNA molecule is accurately described as 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
The increased availability of food sources due to bird feeders likely favored birds with longer beaks, as they can access more food. Birds with shorter beaks may have struggled to feed effectively, leading to lower survival rates. Over time, this selection would result in an increased proportion of longer-beaked birds in the population.
Step 4
Why are the cells from birds described as eukaryotic?
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Answer
The cells from birds are described as eukaryotic because they have membrane-bound organelles.
Step 5
Give one reason why the three domain classification system was proposed.
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Answer
The three domain classification system was proposed to reflect genetic relationships based on genetic analysis, as DNA sequencing provides more accurate relationships among organisms.
