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10 (a) One gene can have several different alleles - Edexcel - GCSE Biology - Question 10 - 2021 - Paper 1
Question 10
10 (a) One gene can have several different alleles. Explain why these alleles can produce proteins with different structures. (b) Monoclonal antibodies are proteins... show full transcript
Worked Solution & Example Answer:10 (a) One gene can have several different alleles - Edexcel - GCSE Biology - Question 10 - 2021 - Paper 1
Step 1
Explain why these alleles can produce proteins with different structures.
Answer
Alleles are different versions of a gene that result from mutations in the DNA sequence. Each allele may have a variation in nucleotide sequences, leading to the production of distinct mRNA strands with unique sequences.
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DNA Sequence Variation: Different alleles possess variations in their DNA sequences, which may result in the production of different mRNA molecules.
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mRNA Transcription: When genes are transcribed, these alleles produce mRNA that has different triplet sequences. This can affect the codons read during translation.
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Amino Acid Coding: Each unique mRNA sequence codes for potentially different amino acids or orders of amino acids, which ultimately influences the folding of proteins.
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Protein Folding: The order of amino acids determines how a protein folds, and this can lead to variations in the structure and function of the proteins produced by different alleles.
Step 2