Question

What will be the results if crossing over does not occur at exactly equivalent positions on two homologous chromosomes?

Answer 1

If crossing over does not occur at exactly equivalent positions on two homologous chromosomes, it leads to chromosomal mutations. This can cause duplications or deletions of chromosomal segments, resulting in an imbalance of genetic material. Such mutations may be lethal or cause serious genetic disorders, as the normal gene sequence and dosage are disrupted. Hence, precise alignment during crossing over is crucial for genetic stability and viability.