Genetics and heredity practice
QCE Biology · Original practice questions with worked solutions
All genetics and heredity practice questions
50 original questions · Page 3 of 3
- Q142 · Original practice · 6 marksGenetics and heredityThe gel profiles show alleles at one autosomal locus. A single diploid individual can have at most two allele bands at this locus. The unknown sample U is compared with references R and S. All four size-marker values label alleles, and distinct alleles have distinct sizes. Assume complete amplification, no new mutations and no additional artefact bands.
- Q143 · Original practice · 7 marksGenetics and heredityA vector is 3000 bp. The intended gene insert is 600 bp. One complete digest cuts each circular plasmid once, showing total length. A second complete digest cuts on both sides of the insert. A gene-specific PCR should produce a 200 bp band if the tested region of the intended gene is present. All positive-control reactions work; empty-vector controls give no…