How would an object blocking a bronchus affect its airflow?

Because the lung has two bronchi, it can still function if one bronchus is blocked by a foreign object. No gas exchange will happen to the affected side, and the other lung will compensate for the loss of air. The blocked portion though can become inflamed and can lead to infection and damage.

Homologous chromosomes with heterozygous alleles d) heterozygous chromosomes with homozygous alleles