<span>The correct answer is B. As one parent cactus is dominant heterozygous, and another is homozygous recessive, half of the progeny will bear long needles (as they carry dominant allele L), and hald will bear short needles (As they carry both recessive alleles).</span>
Answer:
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Explanation:
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The process of DNA replication leads to the build up of torsional stress in the synthesised DNA helix. This torsional stress is due to the presence of tighter turns within the newly synthesised DNA helix. The DNA replication machinery then recruits the DNA topoisomerase enzyme to release the torsional stress by cleaving the synthesised DNA strands, followed by their ligation.