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VICBiologyQuick questions
Unit 2: How does inheritance impact on diversity?
Quick questions on Genes, alleles and the genome: VCE Biology Unit 2
6short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is gene?Show answer
A gene is a length of DNA at a specific location (a locus) on a chromosome that codes for a functional product. Most genes code for a polypeptide (a protein or part of one) by being transcribed to mRNA and translated. Other genes code for functional RNAs (tRNA, rRNA, microRNAs).
What is allele?Show answer
An allele is a variant of a gene. Most genes exist in two or more allelic forms in a population because of historical mutations.
What is genome?Show answer
A genome is the complete set of DNA in a cell, including:
What is q1?Show answer
Define the terms gene, allele and genome, and give a one-line example for each. [3 marks]
What is q2?Show answer
A monohybrid cross between two heterozygotes (Aa x Aa) produces 240 offspring. Predict how many are homozygous dominant, heterozygous and homozygous recessive. [3 marks]
What is q3?Show answer
Refer to the Wollemi pine. (a) Explain the difference between having the same genome and having the same alleles. (b) Suggest why low allelic diversity threatens the species.
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