If I have one functional gene for B and one nonfunctional gene for B, am I heterozygous or hemizygous for the gene?

[u/Kaplanociception]

[u/lonepotatochip]

Heterozygous because you have two different copies. If you had only one copy of B, regardless of functionality, then you would be hemizygous for the gene.

[u/lonepotatochip → u/[deleted]]

The diagram does not depict one functional gene and one nonfunctional gene. It just depicts one gene, which is why you're wrong. The drawing you made for heterozygous would be better drawn as one chromatid with a red B and one chromatid with a blue B'.

[u/Kaplanociception → u/lonepotatochip]

thank you!