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Practice problem

Heterozygous vs. Homozygous — Differences & Similarities

By Gabi Slizewska
This picture shows four sets of chromosomes and their alleles for gene B. The first chromosome has two capital B alleles. The second has one capital B and one lowercase b allele. The third has one lowercase b and one uppercase B allele. The fourth has two lowercase b alleles.

Image source: By Darryl Leja CC BY 2.0, via Wikimedia Commons

The picture above shows four chromosomes from four different individuals. The chromosomes contain a gene which codes for hair color. Which chromosomes are homozygous for the gene?

Choose one answer

Type a concept, like “slope” or “photosynthesis”.

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